is 2 1273919 - 1
has 383488 decimal digits
takes 0.040 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LC8095142099DD22Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26723.324868.6567%1195000346550000.13876.2057%23.463570.6018%1.9451%
PrimeNet2560.007562.5000%5500900000.00052.4457%0.008063.4172%0.9172%
GPU722600.120665.0000%5500360000.00030.9306%0.120965.3257%0.3257%
Difference+7+23.2042+3.6567%+1189500+34619000+0.1384+5.2751%+23.3426+5.2761%+5.2761%

Known prime factors (1 factor, 76.6 bits, 0.00601623% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
12739191179038280009046465134732476.64246276030109019744
25 × 32 × 11 × 17 × 59 × 14563641811
2014-03-15591456364181112,70036.46568.107

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-24T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.240%
2013-10-07T16:33:00David Campeaui5-2500k119500034655000---0.139--6.206%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-07-27T00:00:00ANONYMOUSv4_computers21256--0.008--
2001-11-04T00:00:00ANONYMOUSv4_computers21257--0.015--
2003-06-06T00:00:00ANONYMOUSv4_computers21258--0.030--
2003-06-17T00:00:00ANONYMOUSv4_computers21258--0.030--
2022-03-07T17:32:05LordJuliusManual testing258260--0.090--
2009-02-18T07:08:00Sturle Sundeeames.ifi260261--0.121--
2012-09-15T18:40:00AxelssonManual testing261262--0.241--
2012-10-18T21:47:00dbaughManual testing262263--0.771--


ECM factoring results:

Old Calculation Method

Total ECM effort:20.677 GHz-days
Estimated T-Level:25.391
DigitsB1CurvesCompleteFacMiss
2011000300 / 1003.0004.904%
2550000300 / 2801.07134.186%
3025000050 / 6400.07892.479%

New Calculation Method

Total ECM effort:20.677 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100012.2310.000%
25500001.35425.824%
302500000.11389.331%
3510000000.00899.237%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
5000050000002509.61
250000350000005011.06


Lucas-Lehmer results:
No L-L results for M1273919


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-29T21:37:58Oliver KruseGTX-0
117903828000904646513473
B70A3924A62AA9__no
2017-10-21T17:22:51kkmrkkblmbrbkc4.xlarge
117903828000904646513473
B70A3924A62AA9__no


P-1 factor-bounds graph:
B1 = 1195000, B2 = 34655000 (P-1 stage 2)
B1 = 1195000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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2100
Last modified: 2022-03-07T17:32:05+00:00