Odds for second smallest prime factor code-golf probability-theory sequence Given a prime number \$p\$ output the probability that it is the second smallest prime factor of a positive integer. Input/Output Input: one of the following formats: A prime number \$p\$ A integer \$n\$ to represent the...

Decompile cops-and-robbers In this challenge "cops" will write a computer program and compile it. They will post the result of the compilation (for simplicity we will just call this the "binary"), along with a description of the compilation (what compiler was used, what flags were used etc.), but...

How many cacti can you plant? Given a Minecraft terrain as a 2-dimensional array of integers or similar datastructure, determine the maximum number of cacti that can be planted on it. The integers represent the height of the terrain at each location (x and y). A cactus cannot be planted next to h...

Constructing the Irish possessive natural-language In this challenge you will take an Irish word and a personal pronoun and create the possessive pronoun construction combining the two. For example sé, madra becomes a mhadra. Translated to English he, dog becomes his dog. Rather than exhaustively...

The Rockstar programming language has "poetic number literals", allowing you to assign positive, finite (at least one Rockstar interpreter supports infinity) numbers to variables without typing a single digit: just type words with length equal to each digit, modulo 10. For example, This is a chal...