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

23·3·72 Posts

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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