Question: The program will check something calle Luhns checksum. It is a checksum invented and patented by Hans Peter Luhn, a researcher at IBM, in 1954.

The program will check something calle Luhns checksum. It is a checksum invented and patented by Hans Peter Luhn, a researcher at IBM, in 1954. It is a basic integrity check that can usually detect accidental errors in numbers such as credit cards, or identification numbers. For example, most credit card and bank card numbers use this checksum, and many national identification numbers, including Canadian SIN numbers use it.

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