A little warm-up to begin...
An n-digit number is pandigital if it makes use of all the digits 1 to n exactly ONCE.
For example, the 5-digit number 15234, is 1 through 5 pandigital.
Given a positive integer find whether it is a pandigital number.
Reverse Run-Length Encoder
Extract leading non-zero digit
Filter AC, pass DC
Generalised Hamming Number
Narcissistic number ?
Recycled Numbers (CodeJam Qualification Round 2012)
Chess ELO rating system
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