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#4: Post edited by user avatar trichoplax‭ · 2024-10-06T17:48:33Z (2 months ago)
Mark as finalized
  • Multiplicative perfection
  • Multiplicative perfection [FINALIZED]
  • Given a positive integer, indicate whether it is the product of its proper divisors.
  • Integers equal to the product of their proper divisors can be found on the Online Encyclopedia of Integer Sequences as the [Multiplicatively perfect numbers](https://oeis.org/A007422).
  • ## Input
  • - A positive integer N.
  • ## Output
  • - One of 2 distinct values to indicate whether N is equal to the product of its proper divisors (that is, the product of all positive integers strictly less than N that divide exactly into N).
  • - Note that the input 1 counts as the product of its proper divisors, despite having no proper divisors. The product of an empty set of numbers is 1.
  • ## Examples
  • Input | Proper divisors | Product | Input = Product ?
  • ------|-----------------|---------|-----------------
  • 1 | - | 1 | true
  • 6 | 1, 2, 3 | 6 | true
  • 8 | 1, 2, 4 | 8 | true
  • 9 | 1, 3 | 3 | false
  • 11 | 1 | 1 | false
  • 12 | 1, 2, 3, 4, 6 | 144 | false
  • ## Test cases
  • Test cases are in the format `input : output`.
  • Note that the outputs can be any 2 distinct values. They do not have to be `true` and `false`.
  • ```text
  • 1 : true
  • 2 : false
  • 3 : false
  • 4 : false
  • 5 : false
  • 6 : true
  • 7 : false
  • 8 : true
  • 9 : false
  • 10 : true
  • 11 : false
  • 12 : false
  • 13 : false
  • 14 : true
  • 15 : true
  • 16 : false
  • 17 : false
  • 18 : false
  • 19 : false
  • 20 : false
  • 21 : true
  • 22 : true
  • 23 : false
  • 24 : false
  • 25 : false
  • 26 : true
  • 27 : true
  • 28 : false
  • 29 : false
  • 30 : false
  • 31 : false
  • 32 : false
  • 33 : true
  • 34 : true
  • 35 : true
  • 36 : false
  • 37 : false
  • 38 : true
  • 39 : true
  • 40 : false
  • 41 : false
  • 42 : false
  • 43 : false
  • 44 : false
  • 45 : false
  • 46 : true
  • 47 : false
  • 48 : false
  • 49 : false
  • 50 : false
  • 51 : true
  • 52 : false
  • 53 : false
  • 54 : false
  • 55 : true
  • 56 : false
  • 57 : true
  • 58 : true
  • 59 : false
  • 60 : false
  • 61 : false
  • 62 : true
  • 63 : false
  • 64 : false
  • 65 : true
  • 66 : false
  • 67 : false
  • 68 : false
  • 69 : true
  • 70 : false
  • 71 : false
  • 72 : false
  • 73 : false
  • 74 : true
  • 75 : false
  • 76 : false
  • 77 : true
  • 78 : false
  • 79 : false
  • 80 : false
  • 81 : false
  • 82 : true
  • 83 : false
  • 84 : false
  • 85 : true
  • 86 : true
  • 87 : true
  • 88 : false
  • 89 : false
  • 90 : false
  • 91 : true
  • 92 : false
  • 93 : true
  • 94 : true
  • 95 : true
  • 96 : false
  • 97 : false
  • 98 : false
  • 99 : false
  • ```
  • ## Scoring
  • This is a [code golf challenge]. Your score is the number of bytes in your code. Lowest score for each language wins.
  • > Explanations are optional, but I'm more likely to upvote answers that have one.
  • [code golf challenge]: https://codegolf.codidact.com/categories/49/tags/4274 "The code-golf tag"
  • # Now posts: [Multiplicative perfection](https://codegolf.codidact.com/posts/292741)
  • ---
  • Given a positive integer, indicate whether it is the product of its proper divisors.
  • Integers equal to the product of their proper divisors can be found on the Online Encyclopedia of Integer Sequences as the [Multiplicatively perfect numbers](https://oeis.org/A007422).
  • ## Input
  • - A positive integer N.
  • ## Output
  • - One of 2 distinct values to indicate whether N is equal to the product of its proper divisors (that is, the product of all positive integers strictly less than N that divide exactly into N).
  • - Note that the input 1 counts as the product of its proper divisors, despite having no proper divisors. The product of an empty set of numbers is 1.
  • ## Examples
  • Input | Proper divisors | Product | Input = Product ?
  • ------|-----------------|---------|-----------------
  • 1 | - | 1 | true
  • 6 | 1, 2, 3 | 6 | true
  • 8 | 1, 2, 4 | 8 | true
  • 9 | 1, 3 | 3 | false
  • 11 | 1 | 1 | false
  • 12 | 1, 2, 3, 4, 6 | 144 | false
  • ## Test cases
  • Test cases are in the format `input : output`.
  • Note that the outputs can be any 2 distinct values. They do not have to be `true` and `false`.
  • ```text
  • 1 : true
  • 2 : false
  • 3 : false
  • 4 : false
  • 5 : false
  • 6 : true
  • 7 : false
  • 8 : true
  • 9 : false
  • 10 : true
  • 11 : false
  • 12 : false
  • 13 : false
  • 14 : true
  • 15 : true
  • 16 : false
  • 17 : false
  • 18 : false
  • 19 : false
  • 20 : false
  • 21 : true
  • 22 : true
  • 23 : false
  • 24 : false
  • 25 : false
  • 26 : true
  • 27 : true
  • 28 : false
  • 29 : false
  • 30 : false
  • 31 : false
  • 32 : false
  • 33 : true
  • 34 : true
  • 35 : true
  • 36 : false
  • 37 : false
  • 38 : true
  • 39 : true
  • 40 : false
  • 41 : false
  • 42 : false
  • 43 : false
  • 44 : false
  • 45 : false
  • 46 : true
  • 47 : false
  • 48 : false
  • 49 : false
  • 50 : false
  • 51 : true
  • 52 : false
  • 53 : false
  • 54 : false
  • 55 : true
  • 56 : false
  • 57 : true
  • 58 : true
  • 59 : false
  • 60 : false
  • 61 : false
  • 62 : true
  • 63 : false
  • 64 : false
  • 65 : true
  • 66 : false
  • 67 : false
  • 68 : false
  • 69 : true
  • 70 : false
  • 71 : false
  • 72 : false
  • 73 : false
  • 74 : true
  • 75 : false
  • 76 : false
  • 77 : true
  • 78 : false
  • 79 : false
  • 80 : false
  • 81 : false
  • 82 : true
  • 83 : false
  • 84 : false
  • 85 : true
  • 86 : true
  • 87 : true
  • 88 : false
  • 89 : false
  • 90 : false
  • 91 : true
  • 92 : false
  • 93 : true
  • 94 : true
  • 95 : true
  • 96 : false
  • 97 : false
  • 98 : false
  • 99 : false
  • ```
  • ## Scoring
  • This is a [code golf challenge]. Your score is the number of bytes in your code. Lowest score for each language wins.
  • > Explanations are optional, but I'm more likely to upvote answers that have one.
  • [code golf challenge]: https://codegolf.codidact.com/categories/49/tags/4274 "The code-golf tag"
#3: Post edited by user avatar trichoplax‭ · 2024-10-04T20:50:17Z (2 months ago)
Improve terminology following Sandbox feedback, and put examples in a table
  • Given a positive integer, indicate whether it is the product of its strict factors.
  • Those that are can be found on the Online Encyclopedia of Integer Sequences as the [Multiplicatively perfect numbers](https://oeis.org/A007422).
  • ## Input
  • - A positive integer N.
  • ## Output
  • - One of 2 distinct values to indicate whether N is equal to the product of its strict factors (that is, the product of all positive integers strictly less than N that divide exactly into N).
  • - Note that the input 1 counts as the product of its strict factors, despite having no strict factors. The product of an empty set of numbers is 1.
  • ## Examples
  • ### True examples
  • - For input 6, the strict factors of 6 are 1, 2, and 3. 1 * 2 * 3 = 6, so 6 is the product of its strict factors.
  • - For input 8, the strict factors of 8 are 1, 2, and 4. 1 * 2 * 4 = 8, so 8 is the product of its strict factors.
  • ### False examples
  • - For input 9, the strict factors of 9 are 1 and 3. 1 * 3 = 3, so 9 is not the product of its strict factors.
  • - For input 11, the strict factors of 11 are just 1, so 11 is not the product of its strict factors.
  • - For input 12, the strict factors of 12 are 1, 2, 3, 4, and 6. 1 * 2 * 3 * 4 * 6 = 144, so 12 is not the product of its strict factors.
  • ## Test cases
  • Test cases are in the format `input : output`.
  • Note that the outputs can be any 2 distinct values. They do not have to be `true` and `false`.
  • ```text
  • 1 : true
  • 2 : false
  • 3 : false
  • 4 : false
  • 5 : false
  • 6 : true
  • 7 : false
  • 8 : true
  • 9 : false
  • 10 : true
  • 11 : false
  • 12 : false
  • 13 : false
  • 14 : true
  • 15 : true
  • 16 : false
  • 17 : false
  • 18 : false
  • 19 : false
  • 20 : false
  • 21 : true
  • 22 : true
  • 23 : false
  • 24 : false
  • 25 : false
  • 26 : true
  • 27 : true
  • 28 : false
  • 29 : false
  • 30 : false
  • 31 : false
  • 32 : false
  • 33 : true
  • 34 : true
  • 35 : true
  • 36 : false
  • 37 : false
  • 38 : true
  • 39 : true
  • 40 : false
  • 41 : false
  • 42 : false
  • 43 : false
  • 44 : false
  • 45 : false
  • 46 : true
  • 47 : false
  • 48 : false
  • 49 : false
  • 50 : false
  • 51 : true
  • 52 : false
  • 53 : false
  • 54 : false
  • 55 : true
  • 56 : false
  • 57 : true
  • 58 : true
  • 59 : false
  • 60 : false
  • 61 : false
  • 62 : true
  • 63 : false
  • 64 : false
  • 65 : true
  • 66 : false
  • 67 : false
  • 68 : false
  • 69 : true
  • 70 : false
  • 71 : false
  • 72 : false
  • 73 : false
  • 74 : true
  • 75 : false
  • 76 : false
  • 77 : true
  • 78 : false
  • 79 : false
  • 80 : false
  • 81 : false
  • 82 : true
  • 83 : false
  • 84 : false
  • 85 : true
  • 86 : true
  • 87 : true
  • 88 : false
  • 89 : false
  • 90 : false
  • 91 : true
  • 92 : false
  • 93 : true
  • 94 : true
  • 95 : true
  • 96 : false
  • 97 : false
  • 98 : false
  • 99 : false
  • ```
  • ## Scoring
  • This is a [code golf challenge]. Your score is the number of bytes in your code. Lowest score for each language wins.
  • > Explanations are optional, but I'm more likely to upvote answers that have one.
  • [code golf challenge]: https://codegolf.codidact.com/categories/49/tags/4274 "The code-golf tag"
  • Given a positive integer, indicate whether it is the product of its proper divisors.
  • Integers equal to the product of their proper divisors can be found on the Online Encyclopedia of Integer Sequences as the [Multiplicatively perfect numbers](https://oeis.org/A007422).
  • ## Input
  • - A positive integer N.
  • ## Output
  • - One of 2 distinct values to indicate whether N is equal to the product of its proper divisors (that is, the product of all positive integers strictly less than N that divide exactly into N).
  • - Note that the input 1 counts as the product of its proper divisors, despite having no proper divisors. The product of an empty set of numbers is 1.
  • ## Examples
  • Input | Proper divisors | Product | Input = Product ?
  • ------|-----------------|---------|-----------------
  • 1 | - | 1 | true
  • 6 | 1, 2, 3 | 6 | true
  • 8 | 1, 2, 4 | 8 | true
  • 9 | 1, 3 | 3 | false
  • 11 | 1 | 1 | false
  • 12 | 1, 2, 3, 4, 6 | 144 | false
  • ## Test cases
  • Test cases are in the format `input : output`.
  • Note that the outputs can be any 2 distinct values. They do not have to be `true` and `false`.
  • ```text
  • 1 : true
  • 2 : false
  • 3 : false
  • 4 : false
  • 5 : false
  • 6 : true
  • 7 : false
  • 8 : true
  • 9 : false
  • 10 : true
  • 11 : false
  • 12 : false
  • 13 : false
  • 14 : true
  • 15 : true
  • 16 : false
  • 17 : false
  • 18 : false
  • 19 : false
  • 20 : false
  • 21 : true
  • 22 : true
  • 23 : false
  • 24 : false
  • 25 : false
  • 26 : true
  • 27 : true
  • 28 : false
  • 29 : false
  • 30 : false
  • 31 : false
  • 32 : false
  • 33 : true
  • 34 : true
  • 35 : true
  • 36 : false
  • 37 : false
  • 38 : true
  • 39 : true
  • 40 : false
  • 41 : false
  • 42 : false
  • 43 : false
  • 44 : false
  • 45 : false
  • 46 : true
  • 47 : false
  • 48 : false
  • 49 : false
  • 50 : false
  • 51 : true
  • 52 : false
  • 53 : false
  • 54 : false
  • 55 : true
  • 56 : false
  • 57 : true
  • 58 : true
  • 59 : false
  • 60 : false
  • 61 : false
  • 62 : true
  • 63 : false
  • 64 : false
  • 65 : true
  • 66 : false
  • 67 : false
  • 68 : false
  • 69 : true
  • 70 : false
  • 71 : false
  • 72 : false
  • 73 : false
  • 74 : true
  • 75 : false
  • 76 : false
  • 77 : true
  • 78 : false
  • 79 : false
  • 80 : false
  • 81 : false
  • 82 : true
  • 83 : false
  • 84 : false
  • 85 : true
  • 86 : true
  • 87 : true
  • 88 : false
  • 89 : false
  • 90 : false
  • 91 : true
  • 92 : false
  • 93 : true
  • 94 : true
  • 95 : true
  • 96 : false
  • 97 : false
  • 98 : false
  • 99 : false
  • ```
  • ## Scoring
  • This is a [code golf challenge]. Your score is the number of bytes in your code. Lowest score for each language wins.
  • > Explanations are optional, but I'm more likely to upvote answers that have one.
  • [code golf challenge]: https://codegolf.codidact.com/categories/49/tags/4274 "The code-golf tag"
#2: Post edited by user avatar trichoplax‭ · 2024-10-03T23:07:05Z (2 months ago)
Wording refinement
  • Given a positive integer, indicate whether it is the product of its strict factors.
  • Those that are can be found on the Online Encyclopedia of Integer Sequences as the [Multiplicatively perfect numbers](https://oeis.org/A007422).
  • ## Input
  • - A positive integer N.
  • ## Output
  • - One of 2 distinct values to indicate whether N is equal to the product of all positive integers less than N that divide exactly into N.
  • - Note that the input 1 counts as the product of its strict factors, despite having no strict factors. The product of an empty set of numbers is 1.
  • ## Examples
  • ### True examples
  • - For input 6, the strict factors of 6 are 1, 2, and 3. 1 * 2 * 3 = 6, so 6 is the product of its strict factors.
  • - For input 8, the strict factors of 8 are 1, 2, and 4. 1 * 2 * 4 = 8, so 8 is the product of its strict factors.
  • ### False examples
  • - For input 9, the strict factors of 9 are 1 and 3. 1 * 3 = 3, so 9 is not the product of its strict factors.
  • - For input 11, the strict factors of 11 are just 1, so 11 is not the product of its strict factors.
  • - For input 12, the strict factors of 12 are 1, 2, 3, 4, and 6. 1 * 2 * 3 * 4 * 6 = 144, so 12 is not the product of its strict factors.
  • ## Test cases
  • Test cases are in the format `input : output`.
  • Note that the outputs can be any 2 distinct values. They do not have to be `true` and `false`.
  • ```text
  • 1 : true
  • 2 : false
  • 3 : false
  • 4 : false
  • 5 : false
  • 6 : true
  • 7 : false
  • 8 : true
  • 9 : false
  • 10 : true
  • 11 : false
  • 12 : false
  • 13 : false
  • 14 : true
  • 15 : true
  • 16 : false
  • 17 : false
  • 18 : false
  • 19 : false
  • 20 : false
  • 21 : true
  • 22 : true
  • 23 : false
  • 24 : false
  • 25 : false
  • 26 : true
  • 27 : true
  • 28 : false
  • 29 : false
  • 30 : false
  • 31 : false
  • 32 : false
  • 33 : true
  • 34 : true
  • 35 : true
  • 36 : false
  • 37 : false
  • 38 : true
  • 39 : true
  • 40 : false
  • 41 : false
  • 42 : false
  • 43 : false
  • 44 : false
  • 45 : false
  • 46 : true
  • 47 : false
  • 48 : false
  • 49 : false
  • 50 : false
  • 51 : true
  • 52 : false
  • 53 : false
  • 54 : false
  • 55 : true
  • 56 : false
  • 57 : true
  • 58 : true
  • 59 : false
  • 60 : false
  • 61 : false
  • 62 : true
  • 63 : false
  • 64 : false
  • 65 : true
  • 66 : false
  • 67 : false
  • 68 : false
  • 69 : true
  • 70 : false
  • 71 : false
  • 72 : false
  • 73 : false
  • 74 : true
  • 75 : false
  • 76 : false
  • 77 : true
  • 78 : false
  • 79 : false
  • 80 : false
  • 81 : false
  • 82 : true
  • 83 : false
  • 84 : false
  • 85 : true
  • 86 : true
  • 87 : true
  • 88 : false
  • 89 : false
  • 90 : false
  • 91 : true
  • 92 : false
  • 93 : true
  • 94 : true
  • 95 : true
  • 96 : false
  • 97 : false
  • 98 : false
  • 99 : false
  • ```
  • ## Scoring
  • This is a [code golf challenge]. Your score is the number of bytes in your code. Lowest score for each language wins.
  • > Explanations are optional, but I'm more likely to upvote answers that have one.
  • [code golf challenge]: https://codegolf.codidact.com/categories/49/tags/4274 "The code-golf tag"
  • Given a positive integer, indicate whether it is the product of its strict factors.
  • Those that are can be found on the Online Encyclopedia of Integer Sequences as the [Multiplicatively perfect numbers](https://oeis.org/A007422).
  • ## Input
  • - A positive integer N.
  • ## Output
  • - One of 2 distinct values to indicate whether N is equal to the product of its strict factors (that is, the product of all positive integers strictly less than N that divide exactly into N).
  • - Note that the input 1 counts as the product of its strict factors, despite having no strict factors. The product of an empty set of numbers is 1.
  • ## Examples
  • ### True examples
  • - For input 6, the strict factors of 6 are 1, 2, and 3. 1 * 2 * 3 = 6, so 6 is the product of its strict factors.
  • - For input 8, the strict factors of 8 are 1, 2, and 4. 1 * 2 * 4 = 8, so 8 is the product of its strict factors.
  • ### False examples
  • - For input 9, the strict factors of 9 are 1 and 3. 1 * 3 = 3, so 9 is not the product of its strict factors.
  • - For input 11, the strict factors of 11 are just 1, so 11 is not the product of its strict factors.
  • - For input 12, the strict factors of 12 are 1, 2, 3, 4, and 6. 1 * 2 * 3 * 4 * 6 = 144, so 12 is not the product of its strict factors.
  • ## Test cases
  • Test cases are in the format `input : output`.
  • Note that the outputs can be any 2 distinct values. They do not have to be `true` and `false`.
  • ```text
  • 1 : true
  • 2 : false
  • 3 : false
  • 4 : false
  • 5 : false
  • 6 : true
  • 7 : false
  • 8 : true
  • 9 : false
  • 10 : true
  • 11 : false
  • 12 : false
  • 13 : false
  • 14 : true
  • 15 : true
  • 16 : false
  • 17 : false
  • 18 : false
  • 19 : false
  • 20 : false
  • 21 : true
  • 22 : true
  • 23 : false
  • 24 : false
  • 25 : false
  • 26 : true
  • 27 : true
  • 28 : false
  • 29 : false
  • 30 : false
  • 31 : false
  • 32 : false
  • 33 : true
  • 34 : true
  • 35 : true
  • 36 : false
  • 37 : false
  • 38 : true
  • 39 : true
  • 40 : false
  • 41 : false
  • 42 : false
  • 43 : false
  • 44 : false
  • 45 : false
  • 46 : true
  • 47 : false
  • 48 : false
  • 49 : false
  • 50 : false
  • 51 : true
  • 52 : false
  • 53 : false
  • 54 : false
  • 55 : true
  • 56 : false
  • 57 : true
  • 58 : true
  • 59 : false
  • 60 : false
  • 61 : false
  • 62 : true
  • 63 : false
  • 64 : false
  • 65 : true
  • 66 : false
  • 67 : false
  • 68 : false
  • 69 : true
  • 70 : false
  • 71 : false
  • 72 : false
  • 73 : false
  • 74 : true
  • 75 : false
  • 76 : false
  • 77 : true
  • 78 : false
  • 79 : false
  • 80 : false
  • 81 : false
  • 82 : true
  • 83 : false
  • 84 : false
  • 85 : true
  • 86 : true
  • 87 : true
  • 88 : false
  • 89 : false
  • 90 : false
  • 91 : true
  • 92 : false
  • 93 : true
  • 94 : true
  • 95 : true
  • 96 : false
  • 97 : false
  • 98 : false
  • 99 : false
  • ```
  • ## Scoring
  • This is a [code golf challenge]. Your score is the number of bytes in your code. Lowest score for each language wins.
  • > Explanations are optional, but I'm more likely to upvote answers that have one.
  • [code golf challenge]: https://codegolf.codidact.com/categories/49/tags/4274 "The code-golf tag"
#1: Initial revision by user avatar trichoplax‭ · 2024-10-01T12:22:29Z (2 months ago)
Multiplicative perfection
Given a positive integer, indicate whether it is the product of its strict factors.

Those that are can be found on the Online Encyclopedia of Integer Sequences as the [Multiplicatively perfect numbers](https://oeis.org/A007422).

## Input
- A positive integer N.

## Output
- One of 2 distinct values to indicate whether N is equal to the product of all positive integers less than N that divide exactly into N.
- Note that the input 1 counts as the product of its strict factors, despite having no strict factors. The product of an empty set of numbers is 1.

## Examples
### True examples
- For input 6, the strict factors of 6 are 1, 2, and 3. 1 * 2 * 3 = 6, so 6 is the product of its strict factors.
- For input 8, the strict factors of 8 are 1, 2, and 4. 1 * 2 * 4 = 8, so 8 is the product of its strict factors.

### False examples
- For input 9, the strict factors of 9 are 1 and 3. 1 * 3 = 3, so 9 is not the product of its strict factors.
- For input 11, the strict factors of 11 are just 1, so 11 is not the product of its strict factors.
- For input 12, the strict factors of 12 are 1, 2, 3, 4, and 6. 1 * 2 * 3 * 4 * 6 = 144, so 12 is not the product of its strict factors.

## Test cases
Test cases are in the format `input : output`.

Note that the outputs can be any 2 distinct values. They do not have to be `true` and `false`.

```text
1 : true
2 : false
3 : false
4 : false
5 : false
6 : true
7 : false
8 : true
9 : false
10 : true
11 : false
12 : false
13 : false
14 : true
15 : true
16 : false
17 : false
18 : false
19 : false
20 : false
21 : true
22 : true
23 : false
24 : false
25 : false
26 : true
27 : true
28 : false
29 : false
30 : false
31 : false
32 : false
33 : true
34 : true
35 : true
36 : false
37 : false
38 : true
39 : true
40 : false
41 : false
42 : false
43 : false
44 : false
45 : false
46 : true
47 : false
48 : false
49 : false
50 : false
51 : true
52 : false
53 : false
54 : false
55 : true
56 : false
57 : true
58 : true
59 : false
60 : false
61 : false
62 : true
63 : false
64 : false
65 : true
66 : false
67 : false
68 : false
69 : true
70 : false
71 : false
72 : false
73 : false
74 : true
75 : false
76 : false
77 : true
78 : false
79 : false
80 : false
81 : false
82 : true
83 : false
84 : false
85 : true
86 : true
87 : true
88 : false
89 : false
90 : false
91 : true
92 : false
93 : true
94 : true
95 : true
96 : false
97 : false
98 : false
99 : false
```

## Scoring
This is a [code golf challenge]. Your score is the number of bytes in your code. Lowest score for each language wins.

> Explanations are optional, but I'm more likely to upvote answers that have one.


[code golf challenge]: https://codegolf.codidact.com/categories/49/tags/4274 "The code-golf tag"