is 2 2373967 - 1
has 714636 decimal digits
takes 0.160 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LEDBCF4B81B2E23DDdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26825.107767.6471%60000001800000001.51648.9846%26.624170.5538%2.9068%
PrimeNet2590.032362.7119%100001700000.00182.4745%0.034263.6346%0.9227%
GPU722630.672365.0794%100001400000.00171.2720%0.674065.5235%0.4442%
Difference+5+24.4354+2.5677%+5990000+179860000+1.5147+7.7126%+25.9501+5.0303%+5.0303%

Known prime factors (1 factor, 71.6 bits, 0.00301595% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
237396735729013361313396864572271.598752517060290084
22 × 197 × 954970888693
2021-01-07197954970888693255.635,096.69,519.0

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-21T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.231%
2010-02-12T10:19:00Budannan50000010000000---0.100--4.387%
2018-02-09T00:35:36Sid & AndyHand_In_The_Box600000018000000012---1.516--8.985%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-01T00:00:00ANONYMOUSv4_computers21259--0.032--
2016-02-23T16:29:13Mark RoseManual testing259260--0.032--
2009-01-14T14:58:00Sturle Sundegibsy.ifi260261--0.065--
2012-05-31T14:43:00Sebastian HornbostelManual testing261262--0.129--
2013-12-04T21:14:00Jerry HallettManual testing262263--0.414--
2015-03-09T12:35:00VictordeHollanderManual testing263264--0.827--
2015-03-09T12:35:00VictordeHollanderManual testing264265--1.574--
2015-10-31T16:44:13ramgeisManual testing265266--3.148--
2017-06-16T21:40:03Gordon SpenceManual testing266267--6.296--
2019-04-01T13:34:44TJAOIManual testing267268--12.59--


ECM factoring results:

Old Calculation Method

Total ECM effort:9.777 GHz-days
Estimated T-Level:21.964
DigitsB1CurvesCompleteFacMiss
2011000110 / 1001.10033.103%
2550000110 / 2800.39367.465%

New Calculation Method

Total ECM effort:9.777 GHz-days
Estimated T-Level:21.964
DigitsB1CompleteFacMiss
20110003.5482.877%
25500000.32172.564%
302500000.02098.045%


ECM Summary

B1B2factorcurvesGHz-days
5000050000001099.69
50000500000010.089


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-26T00:00:00ANONYMOUSv4_computersEDBCF4B81B2E23DD0.160
2018-05-14T04:50:21kkmrkkblmbrbkoldEDBCF4B81B2E23DD0.160


PRP results:
dateuseridcompidcofactorsres64PRP
2021-01-07T05:47:21mrhw
3572901336131339686457
0E9F316BEB222BE9no
2021-01-07T20:09:14Lisander Viaene
3572901336131339686457
0E9F316BEB222BE9no


P-1 factor-bounds graph:
B1 = 6000000, B2 = 180000000 (P-1 stage 2)
B1 = 6000000 (P-1 stage 1)
B1 = 500000, B2 = 10000000 (P-1 stage 2)
B1 = 500000 (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: 2021-01-07T20:09:14+00:00