is 2 649081 - 1
has 195393 decimal digits
takes 0.010 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L4656FD1F26457552double-checked
PRP42FBE7BA8B6A39EAverified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual269183.932071.0145%250000007500000001.42119.8811%185.353173.8786%2.8641%
PrimeNet2400.000050.0000%60002400000.000420.9502%0.000460.4751%10.4751%
GPU722440.000054.5455%110004000000.000715.9557%0.000761.7981%7.2526%
Difference+25+183.9320+16.4690%+24989000+749600000+1.4204-6.0746%+185.3524+12.0805%+12.0805%

Known prime factors (1 factor, 81.2 bits, 0.01250472% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
64908127123046514728422525435832581.1662089342201876839911
19 × 503 × 38707 × 5648049289
2021-01-313870756480492891,383,4186.780512.663

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-01-02T00:00:00ANONYMOUSv4_computers2000200000---0.000--0.123%
2002-01-22T00:00:00ANONYMOUSv4_computers4096409600---0.001--0.280%
2002-03-10T00:00:00ANONYMOUSv4_computers8192819200---0.001--0.532%
2002-05-05T00:00:00ANONYMOUSv4_computers163841638400---0.002--0.900%
2002-07-06T00:00:00ANONYMOUSv4_computers327683276800---0.005--1.398%
2002-10-07T00:00:00ANONYMOUSv4_computers655366553600---0.009--2.027%
2003-06-01T00:00:00ANONYMOUSv4_computers13107213107200---0.018--2.782%
2011-07-10T12:45:00Jocelyn LaroucheManual testing349103349103---0.008--1.125%
2011-09-05T00:50:00Jocelyn LaroucheManual testing581839581839---0.013--1.439%
2012-06-19T02:42:00Jocelyn LaroucheManual testing649087649087---0.014--1.512%
2012-08-11T13:19:00Jocelyn LaroucheManual testing12981621298162---0.029--2.027%
2013-10-22T10:36:00David Campeaui5-2500k130000041600000---0.077--5.006%
2015-11-15T23:15:48Sid & AndyWoody649081019472430012---0.369--7.485%
2020-11-24T22:22:01Carlos PinhoHomeComputer4600019820006---0.003--1.397%
2021-01-16T05:57:05ViliamF32500000075000000012---1.421--9.881%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2000-01-19T00:00:00ANONYMOUSv4_computers253254--0.002--
2022-03-06T20:00:34Team_InspectorManual testing254255--0.004--
2022-03-06T23:02:11LordJuliusManual testing254255--0.004--
2001-04-15T00:00:00ANONYMOUSv4_computers21256--0.015--
2001-12-22T00:00:00ANONYMOUSv4_computers21257--0.030--
2003-10-23T00:00:00ANONYMOUSv4_computers21258--0.059--
2008-10-11T15:52:00Sturle Sundedietrich.ifi258259--0.059--
2008-10-11T16:34:00Sturle Sundedietrich.ifi259260--0.118--
2011-01-09T08:29:00Sid & AndyToy_Soldier260261--0.237--
2015-06-01T07:44:00lycornManual testing261262--0.473--
2015-10-20T22:58:38Gordon SpenceManual testing262263--1.512--
2015-10-20T22:58:38Gordon SpenceManual testing263264--3.025--
2017-06-27T04:37:20Smok_bmvManual testing264265--5.756--
2017-07-27T06:25:42Smok_bmvManual testing265266--11.51--
2019-03-20T04:35:45Smok_bmvManual testing266267--23.03--
2022-03-07T01:36:00LordJuliusManual testing266267--23.03--
2019-03-20T04:35:45Smok_bmvManual testing267268--46.05--
2022-03-07T01:36:00LordJuliusManual testing267268--46.05--
2019-03-21T04:32:39Smok_bmvManual testing268269--92.10--


ECM factoring results:

Old Calculation Method

Total ECM effort:10.389 GHz-days
Estimated T-Level:25.516
DigitsB1CurvesCompleteFacMiss
2011000309 / 1003.0904.480%
2550000309 / 2801.10433.103%
3025000066 / 6400.10390.194%

New Calculation Method

Total ECM effort:10.389 GHz-days
Estimated T-Level:25.516
DigitsB1CompleteFacMiss
201100013.3770.000%
25500001.51322.028%
302500000.13187.756%
3510000000.00999.080%


ECM Summary

B1B2factorcurvesGHz-days
5000050000002434.143
25000025000000574.859
2500002500000040.341
25000012899251051.047


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2002-09-14T00:00:00ANONYMOUSv4_computers4656FD1F264575520.010
2015-04-11T15:42:00MadPooManual testing4656FD1F264575520.010


PRP results:
dateuseridcompidcofactorsres64PRP
2021-01-31T12:21:52ViliamF3
2712304651472842252543583
42FBE7BA8B6A39EAno


P-1 factor-bounds graph:
B1 = 25000000, B2 = 750000000 (P-1 stage 2)
B1 = 25000000 (P-1 stage 1)
B1 = 6490810, B2 = 194724300 (P-1 stage 2)
B1 = 6490810 (P-1 stage 1)
B1 = 1300000, B2 = 41600000 (P-1 stage 2)
B1 = 1300000 (P-1 stage 1)
B1 = 1298162 (P-1 stage 1)
B1 = 131072, B2 = 13107200 (P-1 stage 2)
B1 = 649087 (P-1 stage 1)
B1 = 581839 (P-1 stage 1)
B1 = 65536, B2 = 6553600 (P-1 stage 2)
B1 = 349103 (P-1 stage 1)
B1 = 32768, B2 = 3276800 (P-1 stage 2)
B1 = 46000, B2 = 1982000 (P-1 stage 2)
B1 = 131072 (P-1 stage 1)
B1 = 16384, B2 = 1638400 (P-1 stage 2)
B1 = 65536 (P-1 stage 1)
B1 = 8192, B2 = 819200 (P-1 stage 2)
B1 = 46000 (P-1 stage 1)
B1 = 32768 (P-1 stage 1)
B1 = 4096, B2 = 409600 (P-1 stage 2)
B1 = 16384 (P-1 stage 1)
B1 = 2000, B2 = 200000 (P-1 stage 2)
B1 = 8192 (P-1 stage 1)
B1 = 4096 (P-1 stage 1)
B1 = 2000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-03-07T01:36:00+00:00