is 2 1270651 - 1
has 382505 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-LABD297C138093581double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26723.384868.6567%2500000300000000.18376.4178%23.568570.6683%2.0116%
PrimeNet2560.007662.5000%5500900000.00052.4445%0.008063.4167%0.9167%
GPU722600.120965.0000%5500360000.00030.9301%0.121265.3255%0.3255%
Difference+7+23.2639+3.6567%+2494500+29964000+0.1834+5.4878%+23.4473+5.3428%+5.3428%

Known prime factors (1 factor, 75.6 bits, 0.00594662% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1270651557281353678353137598232375.56121928970019240261
32 × 19 × 113 × 163 × 6962353589
2014-03-03163696235358911,21117.43332.560

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-24T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.239%
2012-11-23T07:05:00SergiosiManual testing250000030000000---0.184--6.418%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-07-27T00:00:00ANONYMOUSv4_computers21256--0.008--
2001-11-10T00:00:00ANONYMOUSv4_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--0.091--
2009-02-14T16:08:00Sturle Sundeeames.ifi260261--0.121--
2012-09-15T01:11:00AxelssonManual testing261262--0.242--
2012-10-13T12:00:00dbaughManual testing262263--0.773--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.145 GHz-days
Estimated T-Level:25.391
DigitsB1CurvesCompleteFacMiss
2011000298 / 1002.9805.004%
2550000298 / 2801.06434.432%
3025000050 / 6400.07892.479%

New Calculation Method

Total ECM effort:19.145 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100014.0840.000%
25500001.58720.458%
302500000.13387.509%
3510000000.00999.085%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
5000050000002489.53
25000025000000509.61


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-09-07T00:00:00ANONYMOUSv4_computersABD297C1380935810.040


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-29T21:13:57Oliver KruseGTX-1
55728135367835313759823
7E1C622960380A__no
2017-10-21T14:46:24kkmrkkblmbrbkc4.xlarge
55728135367835313759823
7E1C622960380A__no


P-1 factor-bounds graph:
B1 = 2500000, B2 = 30000000 (P-1 stage 2)
B1 = 2500000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
101
102
103
104
105
106
107
101
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
267
263
262
261
260
258
257
256
250
260
270
280
290
2100
Last modified: 2022-03-07T17:32:05+00:00