UDF Luhn's formula-credit card number validation

By Joseph Gama, 2013/05/21

This UDF will validate a credit card number using Luhn's formula.For example 49927398716 will return 1:
print dbo.luhn('49927398716')
print dbo.luhn(49927398716)
1
1

based on:
Credit cards, validation and the Luhn formula
by
Eduardo Chaves
http://www.webdevelopersjournal.com/articles/validation.html

Algorithm converted to TSQL by Joseph Gama

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UDF Luhn's formula-credit card number validation

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