Luhn algorithm - Wikipedia, the free encyclopedia [http://en.wikipedia.org/wiki/Luhn_algorithm] - 2011-09-06 18:28:48 - public:time creditcard, finance, math, mtow, programming, reference, security, sequences - 8 | id:2601 -
Welcome to the On-Line Encyclopedia of Integer Sequences [http://www.research.att.com/~njas/sequences/Seis.html] - 2009-05-08 05:41:05 - public:time database, encyclopedia, math, mathematics, reference, sequences - 6 | id:3697 -
