is 2 2498603 - 1
has 752155 decimal digits
takes 0.173 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LBE3EB459067E3E4Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26823.855367.6471%2382500857701000.69657.5535%24.551870.0908%2.4438%
PrimeNet2590.030762.7119%100001800000.00192.5376%0.032763.6581%0.9462%
GPU722630.638865.0794%110001700000.00201.4073%0.640765.5708%0.4914%
Difference+5+23.2165+2.5677%+2371500+85600100+0.6946+6.1462%+23.9111+4.5200%+4.5200%

Known prime factors (1 factor, 75.7 bits, 0.00302941% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2498603610760492400618871733212375.69312222039523698220
22 × 5 × 19 × 32163261904469
2020-06-0919321632619044694,839.0176,239329,166

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-23T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.235%
2003-10-31T00:00:00Team Prime Ribv4_computers15000228750---0.003--0.787%
2010-12-16T22:39:00Jocelyn LaroucheManual testing2000020000---0.002--0.264%
2011-01-25T11:44:00Oscar Östlin950001971250---0.020--2.388%
2014-09-10T00:51:00Jocelyn LaroucheManual testing120688120688---0.012--0.917%
2014-12-16T04:39:00mikrMSI238250085770100---0.697--7.554%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-05-02T00:00:00ANONYMOUSv4_computers21259--0.031--
2016-02-23T16:29:15Mark RoseManual testing259260--0.031--
2009-01-11T00:54:00Sturle Sundegnom.ifi260261--0.061--
2012-06-11T17:42:00Sebastian HornbostelManual testing261262--0.123--
2013-01-14T11:53:00dbaughManual testing262263--0.393--
2015-03-03T21:37:00VictordeHollanderManual testing263264--0.786--
2015-03-03T21:37:00VictordeHollanderManual testing264265--1.495--
2015-10-31T16:44:07ramgeisManual testing265266--2.991--
2017-07-27T10:22:10Gordon SpenceManual testing266267--5.982--
2019-03-04T13:44:30TJAOIManual testing267268--11.96--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.677 GHz-days
Estimated T-Level:2.000
DigitsB1CurvesCompleteFacMiss
201100040 / 1000.40066.897%
255000040 / 2800.14386.666%

New Calculation Method

Total ECM effort:3.677 GHz-days
Estimated T-Level:2.000
DigitsB1CompleteFacMiss
20110001.29027.518%
25500000.11788.993%
302500000.00799.284%


ECM Summary

B1B2factorcurvesGHz-days
500005000000393.585
50000500000010.092


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-16T00:00:00ANONYMOUSv4_computersBE3EB459067E3E4B0.173
2018-06-02T00:43:08kkmrkkblmbrbkoldBE3EB459067E3E4B0.173


PRP results:
dateuseridcompidcofactorsres64PRP
2020-06-10T21:50:43CrypticCluecruncher
61076049240061887173321
07E0942D2F7FE284no
2020-06-12T03:02:16Luigi Morelli9800X
61076049240061887173321
07E0942D2F7FE284no


P-1 factor-bounds graph:
B1 = 2382500, B2 = 85770100 (P-1 stage 2)
B1 = 2382500 (P-1 stage 1)
B1 = 95000, B2 = 1971250 (P-1 stage 2)
B1 = 120688 (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: 2020-06-12T03:02:16+00:00