Nice.
You have a typo here:
f(21) = (23 * 854) % 1000 = 17934 % 1000 = 934.
I wouldn't be surprised if the last four digits are some form of built-in barcode error checking, and are not used anywhere else.
You have a typo here:
f(21) = (23 * 854) % 1000 = 17934 % 1000 = 934.
I wouldn't be surprised if the last four digits are some form of built-in barcode error checking, and are not used anywhere else.
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