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{{Short description|Simple checksum formula}}
The '''Luhn algorithm''' or '''Luhn formula''', also known as the "[[modular arithmetic|modulus]] 10" or "mod 10" [[algorithm]], named after its creator, [[IBM]] scientist [[Hans Peter Luhn]], is a simple [[check digit]] formula used to validate a variety of identification numbers.
It is described in U.S. Patent No. 2,950,048, granted on August 23, 1960.<ref name="patent">{{cite patent |country=US |number=2950048A |status=patent |title=Computer for verifying numbers |pubdate=1960-08-23 |fdate=1954-01-06 |inventor1-first=Hans P. |inventor1-last=Luhn |inventorlink=Hans Peter Luhn}}</ref>
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