is 2 2485649 - 1
has 748255 decimal digits
takes 0.172 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP76FB0D6479C53170verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26823.979667.6471%2382500857701000.69657.5495%24.676170.0896%2.4425%
PrimeNet2590.030962.7119%100001800000.00192.5351%0.032863.6572%0.9453%
GPU722630.642165.0794%110001600000.00191.3805%0.644065.5614%0.4821%
Difference+5+23.3375+2.5677%+2371500+85610100+0.6946+6.1691%+24.0321+4.5281%+4.5281%

Known prime factors (1 factor, 78.3 bits, 0.00315067% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
24856493759067076945850521135292478.31575615404205216636
22 × 32 × 2100427894589351
2021-05-209210042789458935143,05111,509,35321,496,266

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-14T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.235%
2003-10-31T00:00:00Team Prime Ribv4_computers15000228750---0.003--0.786%
2010-12-22T11:37:00Jocelyn LaroucheManual testing2000020000---0.002--0.263%
2011-01-22T06:44:00Oscar Östlin950001947500---0.020--2.379%
2014-09-03T20:52:00Jocelyn LaroucheManual testing120822120822---0.012--0.917%
2014-11-13T10:01:00mikrMSI238250085770100---0.697--7.550%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2021-05-20T20:00:10riccardo ubertiColab_noGPU1525000005000000027--0.637
2021-05-20T23:28:18riccardo ubertiColab_noGPU1525000005000000065--0.637


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-05-02T00:00:00ANONYMOUSv4_computers21259--0.031--
2016-02-23T16:29:15Mark RoseManual testing259260--0.031--
2009-01-15T01:11:00Sturle Sundegobi.ifi260261--0.062--
2012-06-10T11:42:00Sebastian HornbostelManual testing261262--0.124--
2013-12-04T21:13:00Jerry HallettManual testing262263--0.395--
2015-03-03T21:37:00VictordeHollanderManual testing263264--0.790--
2015-03-03T21:37:00VictordeHollanderManual testing264265--1.503--
2015-10-30T09:42:34ramgeisManual testing265266--3.006--
2017-07-22T20:28:38Gordon SpenceManual testing266267--6.013--
2019-06-10T09:46:16TJAOIManual testing267268--12.03--


ECM factoring results:

Old Calculation Method

Total ECM effort:11.579 GHz-days
Estimated T-Level:22.250
DigitsB1CurvesCompleteFacMiss
2011000126 / 1001.26028.186%
2550000126 / 2800.45063.711%

New Calculation Method

Total ECM effort:11.579 GHz-days
Estimated T-Level:22.250
DigitsB1CompleteFacMiss
20110004.8460.786%
25500000.44963.858%
302500000.02897.211%
3510000000.00199.868%


ECM Summary

B1B2factorcurvesGHz-days
50000500000012211.21
50000515000040.372


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-09T00:00:00ANONYMOUSv4_computers8CD2E1D2275260__0.172


PRP results:
dateuseridcompidcofactorsres64PRP
2021-05-20T16:49:10riccardo ubertiNomad2C
375906707694585052113529
76FB0D6479C53170no


P-1 factor-bounds graph:
B1 = 2382500, B2 = 85770100 (P-1 stage 2)
B1 = 2382500 (P-1 stage 1)
B1 = 95000, B2 = 1947500 (P-1 stage 2)
B1 = 120822 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
B1 = 15000, B2 = 228750 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (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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Last modified: 2021-05-20T23:28:18+00:00