is 2 2062391 - 1
has 620842 decimal digits
takes 0.136 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LB3F819ECA033F275double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26714.407568.6567%500000150000000.12305.1420%14.530570.2684%1.6117%
PrimeNet2580.018663.7931%90001600000.00162.6687%0.020364.7593%0.9662%
GPU722620.297966.1290%90001300000.00151.3653%0.299466.5915%0.4624%
Difference+5+14.1096+2.5277%+491000+14870000+0.1215+3.7767%+14.2311+3.6769%+3.6769%

Known prime factors (1 factor, 69.1 bits, 0.00334968% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
20623916254293358124276103372169.083151627246194448
24 × 17 × 23 × 24237091783
2015-07-16232423709178389.108125.89235.13

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-24T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.275%
2009-06-22T20:55:00harleeT7500_220020000260000---0.003--1.017%
2010-12-26T02:29:00Jocelyn LaroucheManual testing3000030000---0.003--0.413%
2011-01-06T01:06:00Jocelyn LaroucheManual testing5000050000---0.005--0.594%
2011-01-21T13:19:00James Heinrichi7-9201350002902500---0.027--3.046%
2014-10-28T23:25:00Jocelyn LaroucheManual testing166121166121---0.016--1.210%
2016-03-16T13:42:51alpertronManual testing5000001500000012---0.123--5.142%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-10T00:00:00ANONYMOUSv4_computers21258--0.019--
1999-04-13T00:00:00ANONYMOUSv4_computers21258--0.019--
2022-03-09T08:13:23LordJuliusManual testing21260--0.074--
2009-01-02T20:56:00Sturle Sundegowin.ifi260261--0.074--
2012-03-13T20:44:00Sebastian HornbostelManual testing261262--0.149--
2013-09-01T20:20:00ramgeisManual testing262263--0.476--
2015-03-28T18:03:00VictordeHollanderManual testing263264--0.952--
2015-03-28T18:03:00VictordeHollanderManual testing264265--1.812--


ECM factoring results:

Old Calculation Method

Total ECM effort:2.038 GHz-days
Estimated T-Level:1.200
DigitsB1CurvesCompleteFacMiss
201100024 / 1000.24078.568%
255000024 / 2800.08691.772%

New Calculation Method

Total ECM effort:2.038 GHz-days
Estimated T-Level:1.200
DigitsB1CompleteFacMiss
20110000.77446.108%
25500000.07093.242%
302500000.00499.570%


ECM Summary

B1B2factorcurvesGHz-days
500005000000221.868
50000500000020.170


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-09-14T00:00:00ANONYMOUSv4_computersB3F819ECA033F2750.136


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-06T11:18:16Oliver KruseGTX-1
625429335812427610337
798AD2A001D3B4__no
2017-11-16T00:31:58kkmrkkblmbrbkc4.xlarge
625429335812427610337
798AD2A001D3B4__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 135000, B2 = 2902500 (P-1 stage 2)
B1 = 166121 (P-1 stage 1)
B1 = 135000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 20000, B2 = 260000 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
B1 = 20000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
100
101
102
103
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106
100
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1010
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TF factor-bounds graph:
267
265
264
263
262
261
260
258
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260
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2100
Last modified: 2022-03-09T08:13:23+00:00