Luhn test of credit card numbers: Difference between revisions
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1234567812345670 = True</pre>
=={{header|Mathematica}}/{{header|Wolfram Language}}==
<lang Mathematica>LuhnQ[nb_] := (Mod[Total[(2*ToExpression[#[[2;;All;;2]]]) /. {z_?(Function[v, v>9]) -> z-9}]
+ Total[ToExpression[#[[1;;All;;2]]]], 10] == 0)& [Characters[StringReverse[ToString[nb]]] ]
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