# All Questions

10,299 questions
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### Print a square!

Print this text: _________ | | | | | | |_________| Shortest code wins. Notice the space at the start of the first line.
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### Split Mark's marks

Challenge Mark is a student who receives his N marks in a concatenated way in a one single line. The challenge is to separate his marks, knowing that each mark ...
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### Self-contained powers

Given integer n, output the smallest exponent e greater than 1 such that n^e contains ...
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### Number in Number-squared

Consider a sequence of natural numbers for which N appears as a substring in N^2. A018834 Output the nth element of this sequence. Rules Program takes only ...
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### Number letter counts [closed]

If the numbers 1 to 5 are written out in words: one, two, three, four, five, then there are 3 + 3 + 5 + 4 + 4 = 19 letters used in total. Output how many letters would be used if all the numbers from ...
170 views

### Golf some ones, and a program too [closed]

Introduction Busy Beavers are programs (specifically Turing Machine programs) that aim to output the most ones as possible, while having the least states as possible and halting. Challenge Your ...
838 views

### Largest Number in Brainfuck BigInt for each program length up to 50 instructions

This challenge is for the largest finite number you can get BrainFuck programs of given lengths to contain in memory. We must use one of the BF versions that uses big integers for the cells rather ...
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Challenge Calculate the strange sum of two natural numbers (also known as lunar addition): Given A=... a2 a1 a0 and ...
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### Largest and Smallest Possible Number

Task Given an array of non-negative numbers, output the largest and smallest possible number that can be formed by joining them. Rules Input,Output can be in any convenient format. The array may ...