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I Identify factorial

  1. Jul 5, 2016 #1
    Is there a way to identify a factorial without referring to computation of a factorial?

    For example, is there a way to identify 5040 as a factorial and a way to identify 5050 as not a factorial?
     
  2. jcsd
  3. Jul 6, 2016 #2

    chiro

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  4. Jul 6, 2016 #3
    You can check divisibility by ##2##, ##3##, etc. That is often very easy to do.

    Also, check Wilson's theorem.
     
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