That doesn't give a correct answer for the test UPC at the link provided by the OP, 064200115896. My interpretation of the algorithm was that whether to multiply by 3 or not based on whether the digit's position is odd or even, not its value.

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In reply to Re^2: Summing the odd/even digits of a larger number (for upc check digits)...a better way? by sgifford
in thread Summing the odd/even digits of a larger number (for upc check digits)...a better way? by EvanK

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