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13431Composite nos

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  • navid_altaf
    Sep 1, 2003
      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?

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