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# Posts tagged math

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22 posts
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Given a potentially recurring binary string, output the number it represents, as a fraction in lowest terms. The notation used in this challenge for recurring digits is non-standard. An r is used ...

0 answers  ·  posted 4mo ago by trichoplax‭  ·  edited 4mo ago by trichoplax‭

71%
+3 −0

Take an input string representing a number and convert it to decimal (base 10). However, the base of the input is not specified. Assume the input is in the smallest base for which its digits are va...

5 answers  ·  posted 4mo ago by trichoplax‭  ·  last activity 4mo ago by Shaggy‭

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Challenge Given an array in any suitable format, create a frequency table for it. i.e: Pair each unique element with the number of times it appears in the array. You can return the frequency tabl...

10 answers  ·  posted 7mo ago by Razetime‭  ·  last activity 5mo ago by Moshi‭

Question code-golf math
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Challenge A Niven number is a positive integer which is divisible by the sum of its digits. For example, 81 -&gt; 8+1=9 -&gt; 81%9=0. Your task is to find the first n Niven numbers, given n. Te...

7 answers  ·  posted 6mo ago by Razetime‭  ·  last activity 5mo ago by Shaggy‭

66%
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Multiply complex numbers. 2 space-seperated ones will be input, as follows: (update: you can replace i with j or some other symbol if needed) a+bi -a+bi a-bi -a-bi where a and b are integers ...

7 answers  ·  posted 1y ago by heav‭  ·  last activity 5mo ago by __blackjack__‭

Question code-golf math
81%
+7 −0

Get ready for a comparatively dry question - this is intended to be one of the "the"s of the code-golfing dictionary. Create a program which inputs a base 10 non-negative whole number (without lea...

16 answers  ·  posted 1y ago by AndrewTheCodegolfer‭  ·  last activity 6mo ago by Olin Lathrop‭

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In this challenge, add 2 integers, but if both the integers are 2, output 5. Shortest code in each language wins! Example ungolfed program in Python 3.x def add(x, y): if x == 2 and y == 2: ...

18 answers  ·  posted 1y ago by General Sebast1an‭  ·  last activity 8mo ago by south‭

Question code-golf math number
83%
+8 −0

Goldbach's Conjecture states that every even whole number greater than 2 is the sum of 2 prime numbers. Your task is to return those 2 prime numbers, given an even whole number as input. There are ...

10 answers  ·  posted 2y ago by Quintec‭  ·  last activity 8mo ago by torres‭

Question code-golf math
81%
+7 −0

Background Check out this video on the Collatz conjecture, also known as A006577. If you don't know what this is, we're given an equation of $3x + 1$, and it is applied this way: If $x$ is odd...

15 answers  ·  posted 1y ago by General Sebast1an‭  ·  last activity 8mo ago by torres‭

Question code-golf math number
85%
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Challenge A catalogue type challenge that simply asks: Given an integer n (where n&gt;=0) as input return a truthy value if n is a perfect square or a falsey value if not. Rules You may take...

20 answers  ·  posted 1y ago by Shaggy‭  ·  last activity 9mo ago by Zakk‭

81%
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Challenge Make a program that takes input of 3 non-negative integers: a result and 2 other values that once calculated results to the 3rd value. The program must figure out how to get the 2 fir...

5 answers  ·  posted 1y ago by General Sebast1an‭  ·  last activity 1y ago by radarek‭

Question code-golf math number
87%
+12 −0

Challenge Given a list of n numbers and x, compute $a + bx^1 + cx^{2} + ... + zx^{n-1}$, where a is the first value in the list, b is the second, etc. n is at most 256 and at least 0. The input va...

20 answers  ·  posted 2y ago by moony‭  ·  last activity 1y ago by south‭

Question code-golf math
77%
+5 −0

Challenge A simple challenge: Given a two-dimensional matrix (an array of arrays) of real numbers, compute the determinant. The determinant of a matrix is a mathematical construct used in many ap...

8 answers  ·  posted 1y ago by Moshi‭  ·  last activity 1y ago by radarek‭

Question code-golf math
66%
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Background Inspired by this challenge that is also a mathematical English translator. Challenge Write a program that translates a mathematical expression using English with the following specifi...

1 answer  ·  posted 1y ago by General Sebast1an‭  ·  edited 1y ago by General Sebast1an‭

Question code-golf math string
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+2 −0

Challenge Given the roots of a polynomial (that is, the $x$ values where the polynomial evaluates to zero), as an array of real numbers, return the polynomial's coefficients. That is, given real ...

4 answers  ·  posted 1y ago by Moshi‭  ·  last activity 1y ago by Moshi‭

Question code-golf math
60%
+1 −0

Create a program that gets all perfect squares starting from 0 or 1 without using any methods of multiplication (repetitive addition) and exponentiation (repetitive multiplication). Output them for...

7 answers  ·  posted 1y ago by General Sebast1an‭  ·  last activity 1y ago by General Sebast1an‭

60%
+1 −0

Challenge Create a program that takes input of a string and outputs an integer using the following calculation system: The string can only contain +, -, *, /, ^, ! (or a different character; ! ...

1 answer  ·  posted 1y ago by General Sebast1an‭  ·  edited 1y ago by General Sebast1an‭

80%
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A Juggler sequence is a sequence that begins with a positive integer $a_0$ and each subsequent term is calculated as: a_{k+1} = \begin{cases} \left \lfloor a_k ^ \frac 1 2 \right \rfloor, &amp;...

9 answers  ·  posted 1y ago by caird coinheringaahing‭  ·  last activity 1y ago by Shaggy‭

77%
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Abundant numbers are numbers which are less than their proper divisor sum. For example $18$ is abundant as $1 + 2 + 3 + 6 + 9 = 21 &gt; 18$ Deficient numbers are numbers which are greater than the...

8 answers  ·  posted 1y ago by caird coinheringaahing‭  ·  last activity 1y ago by General Sebast1an‭

84%
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Heavily based on this closed challenge from SE. Description A Sumac sequence starts with two non-zero integers $t_1$ and $t_2.$ The next term, $t_3 = t_1 - t_2$ More generally, $t_n = t_{n-2} ... 9 answers · posted 2y ago by Razetime‭ · edited 1y ago by General Sebast1an‭ 77% +5 −0 About Negabinary Negabinary means base negative two (-2). That is, the$n$th place value is determined by$(-2)^n\$. Negabinary numbers can be evaluated just like any other base system. For exampl...

3 answers  ·  posted 1y ago by Moshi‭  ·  last activity 1y ago by Shaggy‭

Question code-golf math
71%
+3 −0

Define a cool number as a number whose proper divisors (all except for the number itself) have an integral mean. Define a really cool number as a number whose divisors (including itself) are all co...

3 answers  ·  posted 2y ago by Quintec‭  ·  last activity 2y ago by user‭

Question code-golf math
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