is 2 1997693 - 1
has 601366 decimal digits
takes 0.131 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LED2484E291FF904Edouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual271239.315270.4225%19976932497116251.47716.6379%240.792372.3859%1.9633%
PrimeNet2580.019263.7931%80001400000.00142.4783%0.020764.6904%0.8973%
GPU722620.307566.1290%80001100000.00131.2363%0.308866.5478%0.4188%
Difference+9+239.0077+4.2935%+1989693+249601625+1.4759+5.4016%+240.4835+5.8381%+5.8381%

Known prime factors (1 factor, 74.6 bits, 0.00373656% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1997693295376183104147545654792374.6457392932325040623
3 × 67 × 36780757836023
2019-12-1867367807578360233,533.1191,048356,825

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-06-30T05:46:00kurlyhex100000030000000---0.246--4.328%
2018-01-28T11:49:27Jocelyn Larouchelow 4M12165881216588---0.116--1.856%
2018-01-30T12:55:33Jocelyn Larouchelow 4M19976933000000012---0.336--4.655%
2018-02-16T12:53:18Jocelyn Larouchelow 4M19976936000000012---0.492--5.293%
2018-03-09T12:48:31Jocelyn Larouchelow 4M199769312000000012---0.803--5.941%
2018-05-09T11:54:06Jocelyn Larouchelow 4M199769319976930012---1.218--6.424%
2018-11-26T12:53:47Jocelyn LaroucheManual testing199769324971162512---1.477--6.638%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-02T00:00:00ANONYMOUSv4_computers21258--0.019--
2016-02-23T16:29:02Mark RoseManual testing258260--0.058--
2009-04-17T14:05:00Rob_Deetwopc260261--0.077--
2011-05-03T04:17:00XyzzyManual testing21262--0.308--
2016-02-23T16:29:02Mark RoseManual testing261262--0.154--
2011-05-03T04:17:00XyzzyManual testing262263--0.491--
2011-05-03T04:17:00XyzzyManual testing263264--0.983--
2011-05-03T04:17:00XyzzyManual testing264265--1.870--
2014-01-04T17:33:00Never Odd Or EvenManual testing265266--3.741--
2014-01-04T17:33:00Never Odd Or EvenManual testing266267--7.481--
2014-01-04T17:33:00Never Odd Or EvenManual testing267268--14.96--
2014-01-04T17:33:00Never Odd Or EvenManual testing268269--29.93--
2014-01-04T17:33:00Never Odd Or EvenManual testing269270--59.85--
2015-10-18T15:17:03ramgeisManual testing270271--119.7--


ECM factoring results:

Old Calculation Method

Total ECM effort:4.059 GHz-days
Estimated T-Level:2.400
DigitsB1CurvesCompleteFacMiss
201100048 / 1000.48061.729%
255000048 / 2800.17184.220%

New Calculation Method

Total ECM effort:4.059 GHz-days
Estimated T-Level:2.400
DigitsB1CompleteFacMiss
20110001.84615.784%
25500000.17184.297%
302500000.01198.928%


ECM Summary

B1B2factorcurvesGHz-days
500005000000453.806
50000500000030.254


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-05-16T00:00:00ANONYMOUSv4_computersED2484E291FF904E0.131
2015-07-12T18:10:00MadPooManual testingED2484E291FF904E0.131


PRP results:
dateuseridcompidcofactorsres64PRP
2019-12-19T10:59:07Niels_Mache_NextcloudSuperDry-X
29537618310414754565479
E09F7793580DF6A6no
2019-12-22T05:35:31GANKL-SCH05
29537618310414754565479
E09F7793580DF6A6no


P-1 factor-bounds graph:
B1 = 1997693, B2 = 249711625 (P-1 stage 2)
B1 = 1997693, B2 = 199769300 (P-1 stage 2)
B1 = 1997693, B2 = 120000000 (P-1 stage 2)
B1 = 1997693, B2 = 60000000 (P-1 stage 2)
B1 = 1997693, B2 = 30000000 (P-1 stage 2)
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 1997693 (P-1 stage 1)
B1 = 1216588 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2019-12-22T05:35:31+00:00