Challenge: In less than 256 bytes, write a program to output the following string EXACTLY: Hello, world. A trailing new line is permitted, but highly discouraged. The goal of this challenge is to obfuscated your code as much as possible. That is, make it difficult to read, and needlessly com...

A number is a Mersenne Prime if it is both prime and can be written in the form 2n-1, where n is a positive integer. Your task is to, given any integer x > 0, determine whether or not it is a Mersenne prime. You may submit either a function which returns a truthy/falsy value, or a full pro...

Consider the following example challenge: Given a set of integers, output a truthy value if there is a non-empty subset whose sum equals 0, or a falsey value if no such subset exists. Solutions must have worst-case polynomial time complexity or better. This is the subset sum problem, which ...

Prove your language is Turing Complete popularity-contest In this popularity contest, your task is to design and create a program in your favorite language to prove that it is Turing Complete (or Turing equivalent). You can do this in one of the following ways: Running TC cellular automata su...

Your task is to create a program that is to mimic Big Ben (Twitter). Task Whenever a new hour has begun (according to your computer's local time), you have to output BONG repeated hour times (with a space between the words). For example, when it's 3 o' clock, you have to output BONG BONG BONG. ...

Draw a factor circle code-golf math graphical-output This challenge is inspired by this fantastic animated diagram. Given an input n, draw its factor circle, with nested polygons of dots, as specified. For example, given the number 357 = 17x7x3, you arrange 3 dots in a triangle, 7 versions of...

Output the following except from Pachelbel's Canon in D as audio: Rules Any format/encoding may be used, so long as a codec existed prior to the creation of this challenge Any instrument (a real instrument, MIDI synthesis, etc.) may be used The tempo must be 65 BPM (as notated in the sheet m...

This is a code golf. The smallest amount of bytes wins! :) What you need to do You're on Deep Space Nine, a Cardassian outpost taken over by the Federation, in the year 2374. The Borg, a superior race, have collapsed your shields and assimilated half of your crew. However, you have important cl...

A challenge about colors kolmogorov-complexity (Note: Any ideas for a better title?) Above, you can see an image full of different colors, including traditional RGB colours with no transparency, and other colours with an alpha channel. Click here for a hex-dump. Your task is to loslessly ...