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| factorial[n_] := | |
| Block[{$IterationLimit = \[Infinity]}, factorial[n, 1]]; | |
| factorial[0, res_] := res; | |
| factorial[n_, res_] := factorial[n - 1, n res]; | |
| Length @ IntegerDigits @ factorial[100000] // AbsoluteTiming (*{0.96279, 456574}*) | |
| Length @ IntegerDigits @ (100000!) // AbsoluteTiming (* {0.050641, 456574} *) |
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