Test suite needs abs( ).
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Prime factor digits
Calculate the Levenshtein distance between two strings
Project Euler: Problem 4, Palindromic numbers
Airline Ticket Mod7 Checksum
Factorions: Numbers that equal the sum of the factorials of their digits
Filter British English into American English
Dudeney Numbers: Numbers which are the cube of their decimal sum
Find the first N zeros of the 666 function
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