/Luhn-Algorithm

The Luhn algorithm is a simple checksum formula used to validate a variety of identification numbers, such as credit card numbers, IMEI numbers. It was created by IBM scientist Hans Peter Luhn.

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The Luhn algorithm or Luhn formula, also known as the "modulus 10" or "mod 10" algorithm, is a simple checksum formula used to validate a variety of identification numbers, such as credit card numbers, IMEI numbers, National Provider Identifier numbers in US and Canadian Social Insurance Numbers. It was created by IBM scientist Hans Peter Luhn and described in U.S. Patent No. 2,950,048, filed on January 6, 1954, and granted on August 23, 1960.

More information at http://en.wikipedia.org/wiki/Luhn_algorithm