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Old 2016-03-16, 21:11   #2
VictordeHolland
 
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"Victor de Hollander"
Aug 2011
the Netherlands

23·3·72 Posts
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If you want to attempt to factor these low Mersenne numbers, you'll want to run ECM curves with high bounds. ECM with B1=800,000,000 for starters. Prime95 has options to do that. You could also give GMP-ECM a try for the stage 2. Curves wirh higher bounds can find larger factors, but take longer to complete.
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