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Challenges Are they abundant, deficient or perfect?

Jelly, 6 bytes _ÆṣṠ)Ġ Try it online! In order of abundant, perfect, deficient. _ÆṣṠ)Ġ Main Link ) For each from 1 to N _ Subtract Æṣ The proper divisor sum Ṡ Sign ...

posted 3y ago by hyper-neutrino‭  ·  edited 3y ago by hyper-neutrino‭

Answer
#3: Post edited by user avatar hyper-neutrino‭ · 2021-06-16T15:12:49Z (over 3 years ago)
  • # [Jelly], 7 bytes
  • Æs_ḤṠ)Ġ
  • [Try it online!][TIO-kpzllyif]
  • [Jelly]: https://github.com/DennisMitchell/jelly
  • [TIO-kpzllyif]: https://tio.run/##y0rNyan8//9wW3H8wx1LHu5coHlkwf///w0NDAA "Jelly – Try It Online"
  • In order of deficient, perfect, abundant.
  • ```
  • Æs_ḤṠ)Ġ Main Link
  • ) For each number from 1 to N
  • Æs Divisor sum
  • _ Subtract
  • Ḥ Double the input (proper divisor sum is just divisor sum - input)
  • Ṡ Sign; -1 for deficient, 0 for perfect, 1 for abundant
  • Ġ Group equal elements' indices
  • ```
  • # [Jelly], 6 bytes
  • _ÆṣṠ)Ġ
  • [Try it online!][TIO-kpzm4bc4]
  • [Jelly]: https://github.com/DennisMitchell/jelly
  • [TIO-kpzm4bc4]: https://tio.run/##y0rNyan8/z/@cNvDnYsf7lygeWTB////DQ0MAA "Jelly – Try It Online"
  • In order of abundant, perfect, deficient.
  • ```
  • _ÆṣṠ)Ġ Main Link
  • ) For each from 1 to N
  • _ Subtract
  • Æṣ The proper divisor sum
  • Ṡ Sign of the difference
  • Ġ Group equal elements' indices
  • ```
#2: Post edited by user avatar hyper-neutrino‭ · 2021-06-16T15:03:24Z (over 3 years ago)
  • # [Jelly], 7 bytes
  • Æs_ḤṠ)Ġ
  • [Try it online!][TIO-kpzllyif]
  • [Jelly]: https://github.com/DennisMitchell/jelly
  • [TIO-kpzllyif]: https://tio.run/##y0rNyan8//9wW3H8wx1LHu5coHlkwf///w0NDAA "Jelly – Try It Online"
  • # [Jelly], 7 bytes
  • Æs_ḤṠ)Ġ
  • [Try it online!][TIO-kpzllyif]
  • [Jelly]: https://github.com/DennisMitchell/jelly
  • [TIO-kpzllyif]: https://tio.run/##y0rNyan8//9wW3H8wx1LHu5coHlkwf///w0NDAA "Jelly – Try It Online"
  • In order of deficient, perfect, abundant.
  • ```
  • Æs_ḤṠ)Ġ Main Link
  • ) For each number from 1 to N
  • Æs Divisor sum
  • _ Subtract
  • Ḥ Double the input (proper divisor sum is just divisor sum - input)
  • Ṡ Sign; -1 for deficient, 0 for perfect, 1 for abundant
  • Ġ Group equal elements' indices
  • ```
#1: Initial revision by user avatar hyper-neutrino‭ · 2021-06-16T14:57:36Z (over 3 years ago) 
# [Jelly], 7 bytes

    Æs_ḤṠ)Ġ

[Try it online!][TIO-kpzllyif]

[Jelly]: https://github.com/DennisMitchell/jelly
[TIO-kpzllyif]: https://tio.run/##y0rNyan8//9wW3H8wx1LHu5coHlkwf///w0NDAA "Jelly – Try It Online"