4 ms·
https://en.wikipedia.org/wiki/Luhn_algorithm https://en.wikipedia.org/wiki/Luhn_algorithm describes the way the check digit is calculated.
by mjlee 6y ago
https://en.wikipedia.org/wiki/Luhn_algorithm https://en.wikipedia.org/wiki/Luhn_algorithm describes the way the check digit is calculated.
- bausano_michael 6y agoISBN also uses last digit as a check digit: https://en.m.wikipedia.org/wiki/International_Standard_Book_Number#Check https://en.m.wikipedia.org/wiki/International_Standard_Book_...