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MathGroup Archive 1999

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  • To: mathgroup at
  • Subject: [mg19428] FactorIntegerECM
  • From: Hans Havermann <haver at>
  • Date: Mon, 23 Aug 1999 13:57:30 -0400
  • Sender: owner-wri-mathgroup at

I tried this function (available in NumberTheory) on a 105-digit composite
(according to PrimeQ) and it eventually returned the same number. May I
assume that it simply failed to find a factor? Or should I try
ProvablePrimeQ on the number?

Assuming it simply failed to find a factor, what options to
FactorIntegerECM might I set in order to better my chances for finding (on
a re-run) a factor for this size of a composite?

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