is 2 1761437 - 1
has 530246 decimal digits
takes 0.096 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L4325D0B529284897double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26833.838869.1176%17614371937580700.96148.0131%34.800271.5923%2.4746%
PrimeNet2570.010963.1579%80001400000.00122.8059%0.012164.1917%1.0338%
GPU722610.174465.5738%80001200000.00111.4529%0.175566.0739%0.5002%
Difference+7+33.6644+3.5439%+1753437+193638070+0.9603+6.5602%+34.6247+5.5183%+5.5183%

Known prime factors (1 factor, 70.9 bits, 0.00402784% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
176143722774564388111761676392270.948646476836472487
17252107 × 37472341
2020-01-111725210737472341206.391.44382.7619

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-11T15:53:00Carsten Kossendeyleela950001567500---0.014--2.138%
2014-04-08T23:01:00Jocelyn LaroucheManual testing100000100000---0.008--0.770%
2014-05-09T20:31:00Jocelyn LaroucheManual testing136439136439---0.011--0.923%
2014-09-17T22:20:00ANONYMOUSManual testing172878172878---0.014--1.052%
2015-04-30T16:17:00mikrMSI247540086660000---0.556--7.324%
2018-07-10T16:02:43Jocelyn Larouchelow 4M17614378807185012---0.508--7.127%
2018-08-13T11:55:07Jocelyn Larouchelow 4M176143717614370012---0.886--7.906%
2018-10-19T02:38:31Jocelyn Larouchelow 4M176143719375807012---0.961--8.013%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-25T00:00:00ANONYMOUSv4_computers21258--0.022--
2016-02-23T16:28:50Mark RoseManual testing258260--0.065--
2010-04-19T13:16:00Architects Cubedm1_f2260261--0.087--
2016-02-23T16:28:50Mark RoseManual testing261262--0.174--
2010-12-13T03:32:00GrunwalderGIMPManual testing21263--0.906--
2016-02-23T16:28:50Mark RoseManual testing262263--0.557--
2015-04-29T11:32:00snme2pm1Manual testing263264--1.115--
2015-04-29T11:32:00snme2pm1Manual testing264265--2.121--
2015-09-07T08:31:00ramgeisManual testing265266--4.242--
2017-10-16T06:41:24BenGeesManual testing266267--8.485--
2019-08-16T11:17:51TJAOIManual testing267268--16.97--


ECM factoring results:

Old Calculation Method

Total ECM effort:17.263 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:17.263 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024817.06
50000500000030.206


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-28T00:00:00ANONYMOUSv4_computers4325D0B5292848970.096
2015-07-18T19:04:00MadPooManual testing4325D0B5292848970.096


PRP results:
dateuseridcompidcofactorsres64PRP
2020-01-15T18:13:45mnd9office2
2277456438811176167639
916F972F3B8DBE76no
2020-01-17T22:21:01Luigi Morelli9800X
2277456438811176167639
916F972F3B8DBE76no


P-1 factor-bounds graph:
B1 = 1761437, B2 = 193758070 (P-1 stage 2)
B1 = 1761437, B2 = 176143700 (P-1 stage 2)
B1 = 2475400, B2 = 86660000 (P-1 stage 2)
B1 = 1761437, B2 = 88071850 (P-1 stage 2)
B1 = 2475400 (P-1 stage 1)
B1 = 1761437 (P-1 stage 1)
B1 = 95000, B2 = 1567500 (P-1 stage 2)
B1 = 172878 (P-1 stage 1)
B1 = 136439 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2020-08-14T09:34:12+00:00