A car's 17-digit VIN has a similar feature, for model years since 1981.
The 9th digit is the check digit, and it's a much more complex algorithm (since the VIN can have numbers and letters.)
A car's 17-digit VIN has a similar feature, for model years since 1981.
The 9th digit is the check digit, and it's a much more complex algorithm (since the VIN can have numbers and letters.)