is 2 2477659 - 1
has 745850 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-LDBB960962D5ED961double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26824.056967.6471%2382500857701000.69657.5471%24.753570.0888%2.4417%
PrimeNet2590.031062.7119%100001800000.00192.5336%0.032963.6566%0.9447%
GPU722630.644265.0794%110001600000.00191.3796%0.646165.5611%0.4818%
Difference+5+23.4128+2.5677%+2371500+85610100+0.6946+6.1675%+24.1074+4.5276%+4.5276%

Known prime factors (1 factor, 78.9 bits, 0.00318546% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
24776595737593898248359107306072478.925115786593277128917
11 × 13 × 751 × 1078157731669
2019-09-26751107815773166942,7675,907.811,034

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-14T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.234%
2003-10-31T00:00:00Team Prime Ribv4_computers15000228750---0.003--0.785%
2010-11-20T12:24:00Jocelyn LaroucheManual testing2000020000---0.002--0.263%
2011-01-21T00:56:00Oscar Östlin950001947500---0.020--2.378%
2014-09-02T00:10:00Jocelyn LaroucheManual testing120905120905---0.012--0.917%
2014-10-23T20:11:00mikrMSI238250085770100---0.697--7.547%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-02-08T00:00:00S00030v4_computers21258--0.015--
1999-05-02T00:00:00ANONYMOUSv4_computers21259--0.031--
2016-02-23T16:29:15Mark RoseManual testing259260--0.031--
2009-01-16T03:02:00Sturle Sundedittersdorf.ifi260261--0.062--
2012-06-08T23:43:00Sebastian HornbostelManual testing261262--0.124--
2013-01-23T08:29:00dbaughManual testing262263--0.396--
2015-03-03T21:37:00VictordeHollanderManual testing263264--0.792--
2015-03-03T21:37:00VictordeHollanderManual testing264265--1.508--
2015-10-28T09:42:40ramgeisManual testing265266--3.016--
2017-07-22T20:28:36Gordon SpenceManual testing266267--6.032--
2019-05-27T13:36:57TJAOIManual testing267268--12.06--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.122 GHz-days
Estimated T-Level:1.700
DigitsB1CurvesCompleteFacMiss
201100034 / 1000.34071.055%
255000034 / 2800.12188.546%

New Calculation Method

Total ECM effort:3.122 GHz-days
Estimated T-Level:1.700
DigitsB1CompleteFacMiss
20110001.09733.395%
25500000.09990.563%
302500000.00699.391%


ECM Summary

B1B2factorcurvesGHz-days
500005000000333.030
50000500000010.092


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-02-12T00:00:00S00030v4_computersDBB960962D5ED9610.172
1999-05-23T00:00:00ANONYMOUSv4_computersDBB960962D5ED9610.172


PRP results:
dateuseridcompidcofactorsres64PRP
2019-09-27T07:09:46mnd9f4b
573759389824835910730607
669931ECDBE9A566no
2019-09-27T07:29:04ATHec2-PRPCFDC
573759389824835910730607
669931ECDBE9A566no


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 = 120905 (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: 2019-09-27T07:29:04+00:00