is 2 2619671 - 1
has 788600 decimal digits
takes 0.202 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L993ACB50C6588314double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26711.342667.1642 %2000000600000000.57797.6839 %11.920569.6872 %
Target2630.609265.0794 %1200010000000.00741.5326 %0.616665.6146 %
Difference+4+10.7334+2.0848 %+1988000+59000000+0.5705+6.1513%+11.3039+4.0727 %

Known prime factors (1 factor, 65.0 bits, 0.00248258% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2619671378088636406890009212065.0357216338166260
22 × 3 × 5 × 43 × 251 × 11143547
2014-09-14251111435472.78500.06800.1270

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2003-10-31ANONYMOUSv4_computers2048204800--0.0010.670%
2003-11-08Team Prime Ribv4_computers15000217500--0.0031.680%
2010-11-17JossManual testing2000020000--0.0020.628%
2010-12-12markrtiny10000021250006--0.0264.389%
2019-07-04alpertronManual testing20000006000000012
skipped known factor: 37808863640689000921
---10.610%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-03-26ANONYMOUSv4_computers212590.015
2022-03-11LordJuliusManual testing21260
2009-01-31Sturle Sundegiovanni.ifi2602610.059
2012-06-18Grant McCrackenthumper2612620.117
2013-01-14dbaughManual testing2622630.375


ECM factoring results:
Total ECM effort:0.855 GHz-days
Estimated T-Level:1.731
DigitsB1CompleteFacMiss
20110000.34670.740%
25500000.03296.848%
302500000.00299.798%


ECM Summary

B1B2factorcurvesGHz-days
10.093
50000500000090.763


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-04-13ANONYMOUSv4_computers993ACB50C65883140.202


PRP results:
dateuseridcompidcofactorsres64
2017-10-17Oliver KruseGTX-0
37808863640689000921
8167DDECAB330485
2017-12-02kkmrkkblmbrbkc4.xlarge
37808863640689000921
8167DDECAB330485


CERT results:
No CERT results for M2619671


P-1 factor-bounds graph:
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 100000, B2 = 2125000 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 15000, B2 = 217500 (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)
101
102
103
104
105
106
107
101
102
103
104
105
106
107
108
TF factor-bounds graph:
263
262
261
260
259
this exponent TF target: 63
TF double-checked to: 67
ECM T-Level=1.73 ~= -11-bit
250
260
270
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Last modified: 2024-02-09T03:30:02+00:00