is 2 1951051 - 1
has 587325 decimal digits
takes 0.106 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.229768.6567%500000150000000.10155.1078%15.331270.2577%1.6010%
PrimeNet2580.019763.7931%80001400000.00122.4670%0.020964.6863%0.8932%
GPU722620.314966.1290%8000900000.00101.1532%0.315966.5196%0.3906%
Difference+5+14.9148+2.5277%+492000+14910000+0.1005+3.9546%+15.0153+3.7380%+3.7380%

Known prime factors (2 factors, 94.0 bits, 0.00481824% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
195105181944143826.28821
3 × 7
-374.603e-122.531e-74.803e-7
19510512427596769402975189832167.71862212540046441
62212540046441
2020-11-2216221254004644130.089266,627497,986

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1951051198927336818295423580881665692994.006
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:19:13alpertronManual testing5000001500000012-
skipped known factor: 81944143
--0.101--5.108%


Trial Factoring results:
No TF results for M1951051


ECM factoring results:

Old Calculation Method

Total ECM effort:20.973 GHz-days
Estimated T-Level:24.571
DigitsB1CurvesCompleteFacMiss
2011000256 / 1002.5607.631%
2550000256 / 2800.91440.015%

New Calculation Method

Total ECM effort:20.973 GHz-days
Estimated T-Level:24.571
DigitsB1CompleteFacMiss
20110009.0400.012%
25500000.80344.792%
302500000.05095.142%
3510000000.00299.771%


ECM Summary

B1B2factorcurvesGHz-days
500005000000110.765
50000500000040.278
500005524853141.015
500006750000141.111
50000750000021317.80


Lucas-Lehmer results:
No L-L results for M1951051


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-05T05:34:24Oliver KruseGTX-0
81944143
B510D78D331295__no
2017-11-11T13:04:12kkmrkkblmbrbkc4.xlarge
81944143
B510D78D331295__no
2020-11-23T17:23:06rbanovccg_lnx01
81944143
242759676940297518983
EC14D7FD79696088no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-04-21T11:52:21+00:00