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From: Bernardo Sulzbach <mafagafogigante@gmail.com>
Newsgroups: comp.lang.python
Subject: Re: Trailing zeros of 100!
Date: Sat, 2 Jan 2016 15:24:24 -0200
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On Sat, Jan 2, 2016 at 2:56 PM, Robin Koch <robin.koch@t-online.de> wrote:
>
> Yes, should work for n >= 1.
>

The first power of 10 for which it fails in my machine is 10 ^ 17,
which is not that much for modern computers. Discrete math should not
meet floating points.

I would post the "canonical" solution here if Peter Otten hadn't just
posted it. You can use Wolfram Alpha - or Otten's solution - to see
that your solution fails for inputs equal to and larger than 10^17
(there likely is a lower bound, but I won't do binary search to find
it).

-- 
Bernardo Sulzbach