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Old 2012-11-09, 13:02   #4
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"Åke Tilander"
Apr 2011
Sandviken, Sweden

2·283 Posts

Originally Posted by wblipp View Post
yoyo@home user Shawn Reimerdes found a P54 that reduced the unfactored primitive of 21584+1 from C222 to C168. This is the fourth known factor of this primitive. A P33 was previously found by ElevenSmooth. The remaining composite has had sufficient ECM to justify GNFS factoring. It is the smallest unfactored Mersenne composite.

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