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MathGroup Archive 2007

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Re: FactorInteger - MathKernel crashes

  • To: mathgroup at smc.vnet.net
  • Subject: [mg73458] Re: [mg73426] FactorInteger - MathKernel crashes
  • From: Daniel Lichtblau <danl at wolfram.com>
  • Date: Sat, 17 Feb 2007 05:02:35 -0500 (EST)
  • References: <200702160558.AAA15548@smc.vnet.net>

Costa Bravo wrote:
> Hello,
> 
> a1 = 2^4 + 7^24 * 719^2;
> a2 = 2^20 * 29^2 + 13^23;
> a3 = 13^24 + 5^37 * 41 ;
> 
> MathKernel crashes, since I use
> 
> FactorInteger[a1] or
> FactorInteger[a2] or
> FactorInteger[a3]
> 
> Why ??
> 
> If argument of FactorInteger is k*a1 or k*a2 or k*a3 (k = 2,3,4,......) 
> MathKernel also crashes
> 
> $Version
> 5.0 for Microsoft Windows
> 
> Regards,
>   Costa

This was a bug. Fixed for the next release of Mathematica.

The cases k*a1, etc. rely on k being smallish. For example, in version 
5,.2 at least FactorInteger[a1*a2] does not crash.

Daniel Lichtblau
Wolfram Research


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