The puzzle or challenge involves repeated application of some transformation to the input. These puzzles often involve mathematical sequences or fractals.
13
votes
19answers
2k views
Code Golf: 6174 - Kaprekar's mythical constant
Why is the number 6174 so interesting? As defined by Wikipedia
Take any four-digit number, using at
least two different digits. (Leading
zeros are allowed.)
Arrange the digits in ...
7
votes
17answers
1k views
Additive Persistence
The shortest code to pass all possibilities wins.
In mathematics, the persistence of a number measures how many times a certain operation must be applied to its digits until some certain fixed ...
6
votes
9answers
505 views
Hitting 495 (Kaprekar)
Input:
A three digit number
from stdin or as an argument
not all digits are the same
may start with one or two zero's
Order the input-digits ascending and descending to form two new numbers.
...
6
votes
11answers
381 views
Random dice tipping
In a standard dice (die) the numbers are arranged so that opposite faces add to seven.
Write the shortest possible program in your preferred language which outputs a random throw followed by 9 random ...
