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This Alternative formula gives 3, but I have not carefully checked that it agrees with Luhn’s original formula.
Alternatively, just delete that line in the article. [[User:GWT45|GWT45]] ([[User talk:GWT45|talk]]) 04:10, 6 February 2023 (UTC)
:I think you've misread the formula: it's using the "ceiling" operator rather than square brackets. If s=67, then <math>\lceil s/10\rceil = \lceil 6.7\rceil = 7</math>. So the full equation evaluates to 3.
:The first equation <math>10 - (s\operatorname{mod} 10)</math> does look wrong though, since it'd result in 10 rather than 0 if s is a multiple of 10. [[User:JamesHenstridge|James]] ([[User talk:JamesHenstridge|talk]]) 10:54, 4 July 2023 (UTC)
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