is 2 1913719 - 1
has 576087 decimal digits
takes 0.104 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L09211F41B3D5550Bdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26831.146169.1176%80000003200000001.96659.7369%33.112672.1246%3.0070%
PrimeNet2570.010063.1579%90001700000.00143.0910%0.011464.2967%1.1388%
GPU722610.160565.5738%100001700000.00151.7604%0.162066.1798%0.6060%
Difference+7+30.9856+3.5439%+7990000+319830000+1.9650+7.9765%+32.9506+5.9448%+5.9448%

Known prime factors (1 factor, 80.9 bits, 0.00422707% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
191371922470935549742305207571192580.894587101229327354361
3 × 89 × 367 × 977 × 6132550037
2020-01-139776132550037130,19726.28349.089

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-08-09T03:36:00kurlykurlytop100000030000000---0.203--5.684%
2017-12-17T16:12:09mikrS069800000032000000012---1.966--9.737%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-09T00:00:00ANONYMOUSv4_computers21258--0.020--
2016-02-23T16:28:57Mark RoseManual testing258260--0.060--
2009-05-29T20:31:00Architects Cubedi4l_1260261--0.080--
2016-02-23T16:28:57Mark RoseManual testing261262--0.161--
2011-07-17T18:55:00GrunwalderGIMPManual testing21263--0.834--
2016-02-23T16:28:57Mark RoseManual testing262263--0.513--
2015-05-16T20:58:00snme2pm1Manual testing263264--1.026--
2015-05-16T20:58:00snme2pm1Manual testing264265--1.952--
2015-09-02T13:37:00ramgeisManual testing265266--3.905--
2018-02-26T10:32:50TJAOIManual testing266267--7.810--
2019-04-27T16:32:09chuenkitManual testing267268--15.62--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.002 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:19.002 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.4910.021%
25500000.76946.354%
302500000.04895.358%
3510000000.00299.782%


ECM Summary

B1B2factorcurvesGHz-days
500005000000724.998
50000500000020.139
50000660000017713.86


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-21T00:00:00ANONYMOUSv4_computers09211F41B3D5550B0.104
2015-07-14T15:04:00MadPooManual testing09211F41B3D5550B0.104


PRP results:
dateuseridcompidcofactorsres64PRP
2020-01-14T09:17:38Christoph ZengerManual testing
2247093554974230520757119
1F23F0AA5F4E49B1no
2020-01-15T10:37:01rbanovkompro_lnx01
2247093554974230520757119
1F23F0AA5F4E49B1no


P-1 factor-bounds graph:
B1 = 8000000, B2 = 320000000 (P-1 stage 2)
B1 = 8000000 (P-1 stage 1)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-01-06T11:58:04+00:00