is 2 2425469 - 1
has 730139 decimal digits
takes 0.164 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L2445E9C23C410EA9double-checked
PRP5C61653D4789B343verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26824.574667.6471%1986400695240000.55507.1726%25.129669.9676%2.3205%
PrimeNet2590.031762.7119%100001800000.00192.5235%0.033563.6528%0.9410%
GPU722630.658065.0794%100001400000.00171.2776%0.659765.5255%0.4462%
Difference+5+23.9166+2.5677%+1976400+69384000+0.5533+5.8950%+24.4699+4.4421%+4.4421%

Known prime factors (1 factor, 71.1 bits, 0.00293068% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
242546925006493380326097753912271.083515498103260155
5 × 26021 × 3962169811
2020-08-13260213962169811263.4721.14839.494

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-08T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.233%
2010-11-10T11:26:00Jocelyn LaroucheManual testing1500015000---0.001--0.204%
2010-11-26T10:15:00Oscar Östlin7501175011---0.007--0.686%
2011-01-23T22:37:00Oscar Östlin950001923750---0.019--2.363%
2014-04-22T00:49:00mikrMSI198640069524000---0.555--7.173%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-15T00:00:00ANONYMOUSv4_computers21259--0.032--
2016-02-23T16:29:14Mark RoseManual testing259260--0.032--
2009-01-16T01:36:00Sturle Sundebruch.ifi260261--0.063--
2012-06-05T06:42:00Sebastian HornbostelManual testing261262--0.127--
2013-12-04T21:13:00Jerry HallettManual testing262263--0.405--
2015-02-27T20:40:00VictordeHollanderManual testing263264--0.809--
2015-02-27T20:40:00VictordeHollanderManual testing264265--1.540--
2015-10-23T09:34:51ramgeisManual testing265266--3.081--
2017-07-05T06:34:30Gordon SpenceManual testing266267--6.162--
2019-04-22T13:11:33TJAOIManual testing267268--12.32--


ECM factoring results:

Old Calculation Method

Total ECM effort:6.686 GHz-days
Estimated T-Level:3.750
DigitsB1CurvesCompleteFacMiss
201100075 / 1000.75047.059%
255000075 / 2800.26876.465%

New Calculation Method

Total ECM effort:6.686 GHz-days
Estimated T-Level:3.750
DigitsB1CompleteFacMiss
20110002.4198.898%
25500000.21980.360%
302500000.01398.663%


ECM Summary

B1B2factorcurvesGHz-days
500005000000726.419
50000500000030.267


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-26T00:00:00ANONYMOUSv4_computers2445E9C23C410EA90.164
2018-05-20T23:37:38kkmrkkblmbrbkold2445E9C23C410EA90.164


PRP results:
dateuseridcompidcofactorsres64PRP
2020-08-13T13:17:10storm55103570_Ivy_Bridge
2500649338032609775391
5C61653D4789B343no


P-1 factor-bounds graph:
B1 = 1986400, B2 = 69524000 (P-1 stage 2)
B1 = 1986400 (P-1 stage 1)
B1 = 95000, B2 = 1923750 (P-1 stage 2)
B1 = 95000 (P-1 stage 1)
B1 = 75011 (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: 2020-08-13T13:17:10+00:00