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Old 2004-07-20, 16:24   #100
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"William"
May 2003
New Haven

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Default Thomas Lipp Completes M(3960)

Today Thomas Lipp completed the factorization of the Mersenne number M(3960) by splitting the remaining 198 digit composite into two primes of 47 and 151 digits. The P47 is the second largest factor ever found by ElevenSmooth using ECM; the remaining P151 is our sixth largest factor by any method. This is our eighth completed Mersenne factorization. We had previously found a 37 digit factor for this number.

Thomas was using the Prep Server on port 8196. This server prepares numbers that are not yet ready for the Record Server on port 8195. Thus it is disappointing but not surprising that this factor is two digits too small to be listed on Paul Zimmermann's Top 10 This Year or Top 50 All Time pages.

M( 3960 )C: 39096187556642394531977525045534720382003169681
M( 3960 )D

Congratulations, Thomas!

Last fiddled with by wblipp on 2004-07-20 at 16:30
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Old 2004-09-20, 03:29   #101
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"William"
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Default Alan Lawrence finds P28 for M(95040)

Alan Lawrence of Sand County Service Company found a P28 factor of M(95040). For your next vacation rent a Frank Lloyd Wright house in the scenic Wisconsin Dells and visit with Alan. This is the first known factor of the primitive part of M(95040). The 6936 digit composite was tied for the largest number under active search at ElevenSmooth. The remaining 6909 digit composite is now the second largest number under active work.

M( 95040 )C: 4504653355594124185596696961
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Old 2004-10-19, 21:30   #102
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Default Alan Strikes Again

Alan Lawrence has found his second ElevenSmooth factor one month after his first! Back to back factors by the same person has only happened twice before outside of the Special Project.

This time Alan found a P36 factor of M(11880), the second known factor for the primitive part of this number. This reduces the unfactored composite from C853 to C818.

Maybe we should rent a Frank Lloyd Wright house from Alan and ply him with Bass Ale to learn his secrets for finding factors.

M( 11880 )C: 270862271021022330665323288578193201
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