MOD 7 Check Digit - The check digit is the last or ninth number of the PRO number. The first eight numbers are in sequence.
The check digit, or ninth number, will be 0 through 6, and will never exceed 6.
C = Check digit
The check digit is determined or verified by dividing the first eight digits by seven. The remainder of this division is the check digit.
The following table shows the check digit of each decimal remainder when dividing by seven:
28 or .29
.42 or .43
.85 or .86
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