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13432Re: [PrimeNumbers] Composite nos

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  • Andy Swallow
    Sep 1, 2003
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      On Mon, Sep 01, 2003 at 11:04:21AM -0000, navid_altaf wrote:
      >
      > An observation I made (checked for the range 3-10000)suggests
      > that ODD composite nos can be described as follows:
      >
      > - composite(odd)< 121 : divisible by 3,5 or 7
      >
      > - composite(odd)> 121 : will always be the product of a
      > prime no AND a no. indivisible by 3,5, or 7
      >
      >
      > Is it possible to prove this?
      > Any examples of where this does not hold?

      Are you being serious? What do you mean? What about 225? Have you
      thought about this at all? So once you get past 121, there are no
      numbers divisible by 7 and 3? Or 5 and 7? Or 3, 5 and 7? What are you
      on?

      Andy
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