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count zeros in a number

• To: mathgroup at smc.vnet.net
• Subject: [mg121789] count zeros in a number
• From: dimitris <dimmechan at yahoo.com>
• Date: Sun, 2 Oct 2011 02:36:47 -0400 (EDT)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com

Hello.

Consider e.g. the number 24^24*55^55.
This number ends with exactly 55 zeros as the following demonstrate

In[201]:= Mod[24^24*55^55, 10^55]
Mod[24^24*55^55, 10^56]

Out[201]= 0
Out[202]= 20000000000000000000000000000000000000000000000000000000


What I want now is a way to count the zeros that a number ends without
knowing in advance this number of zeros like in the above example.

Thanks in advance.
Dimitris

• Follow-Ups:
  • Re: count zeros in a number
    • From: DrMajorBob <btreat1@austin.rr.com>
  • Re: count zeros in a number
    • From: Ulrich Arndt <ulrich.arndt@data2knowledge.de>
  • Re: count zeros in a number
    • From: Andrzej Kozlowski <akozlowski@gmail.com>
  • Re: count zeros in a number
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>
  • Re: count zeros in a number
    • From: "Harvey P. Dale" <hpd1@nyu.edu>
  • Re: count zeros in a number
    • From: Gabriel Landi <gtlandi@gmail.com>