is 2 1321171 - 1
has 397713 decimal digits
takes 0.042 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L7DC38B2880BC9FF4double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26722.490668.6567%500000150000000.05934.8729%22.549970.1840%1.5273%
PrimeNet2560.007362.5000%60001000000.00052.6019%0.007863.4757%0.9757%
GPU722600.116365.0000%5500400000.00030.9768%0.116665.3419%0.3419%
Difference+7+22.3743+3.6567%+494500+14960000+0.0589+3.8961%+22.4333+4.8422%+4.8422%

Known prime factors (1 factor, 72.8 bits, 0.00551260% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
132117183997744384464049725832272.8313178912660982721
33 × 13 × 9056731227871
2014-03-09279056731227871755.3522,67742,354

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-21T00:00:00Team Prime Ribv4_computers15000217500---0.001--0.794%
2012-11-03T06:31:00kurlysmile50000010000000---0.047--4.503%
2016-03-17T19:04:56alpertronManual testing5000001500000012---0.059--4.873%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-11-03T00:00:00ANONYMOUSv4_computers21257--0.015--
2003-06-17T00:00:00ANONYMOUSv4_computers21258--0.029--
2022-03-07T17:32:33LordJuliusManual testing258260--0.087--
2009-02-14T23:41:00Sturle Sunderodolfo.ifi260261--0.116--
2012-09-14T10:25:00AxelssonManual testing261262--0.233--
2013-01-10T10:19:00dbaughManual testing262263--0.743--


ECM factoring results:

Old Calculation Method

Total ECM effort:20.766 GHz-days
Estimated T-Level:25.391
DigitsB1CurvesCompleteFacMiss
2011000299 / 1002.9904.954%
2550000299 / 2801.06834.309%
3025000050 / 6400.07892.479%

New Calculation Method

Total ECM effort:20.766 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100012.1990.001%
25500001.35125.899%
302500000.11389.347%
3510000000.00899.238%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
5000050000002499.63
250000350000005011.13


Lucas-Lehmer results:
No L-L results for M1321171


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T03:11:29Oliver KruseGTX-2
8399774438446404972583
A72CFBCCAA7E1D__no
2017-10-23T10:08:07kkmrkkblmbrbkc4.xlarge
8399774438446404972583
A72CFBCCAA7E1D__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000, B2 = 10000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 15000, B2 = 217500 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-03-07T17:32:33+00:00