is 2 2335877 - 1
has 703170 decimal digits
takes 0.158 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LD12DADDF40FD2117double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26951.110168.1159%60000001800000001.51648.3084%52.626470.7650%2.6490%
PrimeNet2580.016462.0690%100001900000.00192.9363%0.018463.1827%1.1138%
GPU722620.263064.5161%130002000000.00231.7844%0.265365.1493%0.6332%
Difference+7+50.8470+3.5998%+5987000+179800000+1.5141+6.5240%+52.3611+5.6157%+5.6157%

Known prime factors (1 factor, 77.8 bits, 0.00332940% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
23358772578265713040834319051592477.77155188387767010727
17 × 3246375751000631
2021-06-1317324637575100063125,54617,325,54732,359,296

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-21T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.185%
2010-03-02T08:50:00Budannan50000010000000---0.100--3.964%
2018-02-22T01:21:01Sid & AndyHand_In_The_Box600000018000000012---1.516--8.308%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2016-02-23T16:29:12Mark RoseManual testing21260--0.066--
2009-01-14T20:10:00Sturle Sundeginglo.ifi260261--0.066--
2012-05-27T18:43:00Sebastian HornbostelManual testing261262--0.132--
2013-01-23T08:26:00dbaughManual testing262263--0.420--
2015-03-03T21:35:00VictordeHollanderManual testing263264--0.841--
2015-03-03T21:35:00VictordeHollanderManual testing264265--1.600--
2015-10-25T20:35:18ramgeisManual testing265266--3.199--
2017-06-07T04:04:54Gordon SpenceManual testing266267--6.398--
2019-03-25T14:11:03TJAOIManual testing267268--12.80--
2021-06-10T09:22:33TJAOIManual testing268269--25.59--


ECM factoring results:

Old Calculation Method

Total ECM effort:12.861 GHz-days
Estimated T-Level:22.589
DigitsB1CurvesCompleteFacMiss
2011000145 / 1001.45023.286%
2550000145 / 2800.51859.524%

New Calculation Method

Total ECM effort:12.861 GHz-days
Estimated T-Level:22.589
DigitsB1CompleteFacMiss
20110005.5770.378%
25500000.51659.685%
302500000.03396.797%
3510000000.00299.848%


ECM Summary

B1B2factorcurvesGHz-days
50000500000014312.68
50000520000020.180


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-01T00:00:00ANONYMOUSv4_computersD12DADDF40FD21170.158
2018-05-07T10:28:29kkmrkkblmbrbkoldD12DADDF40FD21170.158


PRP results:
dateuseridcompidcofactorsres64PRP
2021-06-16T14:54:01Sébastien BrouckePortable_Seb
257826571304083431905159
713722662DEBAB49no
2021-06-16T15:22:17ATHec2-PRPCF
257826571304083431905159
713722662DEBAB49no


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: 2021-06-16T15:22:17+00:00