is 2 2002387 - 1
has 602779 decimal digits
takes 0.132 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LF89EEA8110CABEEFdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual270119.332970.0000%580000150800000.13063.8994%119.463571.1698%1.1698%
PrimeNet2580.019263.7931%80001400000.00142.4794%0.020664.6908%0.8977%
GPU722620.306866.1290%80001100000.00131.2370%0.308166.5480%0.4190%
Difference+8+119.0261+3.8710%+572000+14970000+0.1293+2.6625%+119.1554+4.6218%+4.6218%

Known prime factors (1 factor, 68.7 bits, 0.00343314% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
20023874945760777511155074092168.745123496626214392
23 × 3 × 17 × 971 × 311727919
2014-03-1397131172791958.9241.61933.0242

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-04-28T00:00:00Jocelyn Larouchev4_computers20002000---0.000--0.010%
2002-04-28T00:00:00Jocelyn Larouchev4_computers40004000---0.000--0.029%
2003-11-16T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.142%
2006-01-15T00:00:00Jocelyn Larouchev4_computers60006000---0.001--0.049%
2006-01-15T00:00:00Jocelyn Larouchev4_computers1000010000---0.001--0.089%
2007-03-04T00:00:00markrv4_computers1000002000000---0.019--1.834%
2010-11-23T00:51:00Jocelyn LaroucheManual testing200238200238---0.019--0.891%
2013-10-07T20:36:00David CampeauManual testing58000015080000---0.131--3.899%
2016-03-17T19:19:23alpertronManual testing5000001500000012---0.123--3.818%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-02T00:00:00Stephen Woodv4_computers21258--0.019--
2022-03-09T07:16:44LordJuliusManual testing21260--0.077--
2009-01-03T09:27:00Sturle Sundeagrell.ifi260261--0.077--
2011-12-23T11:19:00Sebastian HornbostelManual testing261262--0.153--
2013-02-03T01:39:00dbaughManual testing262263--0.490--
2014-01-01T00:48:00BloodIceManual testing263264--0.980--
2014-01-01T00:48:00BloodIceManual testing264265--1.866--
2014-03-08T13:50:00Never Odd Or EvenManual testing265266--3.732--
2014-03-08T13:50:00Never Odd Or EvenManual testing266267--7.464--
2014-03-08T13:50:00Never Odd Or EvenManual testing267268--14.93--
2014-03-08T13:50:00Never Odd Or EvenManual testing268269--29.86--
2014-03-08T13:50:00Never Odd Or EvenManual testing269270--59.71--


ECM factoring results:

Old Calculation Method

Total ECM effort:2.284 GHz-days
Estimated T-Level:1.350
DigitsB1CurvesCompleteFacMiss
201100027 / 1000.27076.234%
255000027 / 2800.09690.792%

New Calculation Method

Total ECM effort:2.284 GHz-days
Estimated T-Level:1.350
DigitsB1CompleteFacMiss
20110000.87141.855%
25500000.07992.430%
302500000.00599.516%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
500005000000272.284


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-29T00:00:00Stephen Woodv4_computersF89EEA8110CABEEF0.132


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-05T19:07:18Oliver KruseGTX-3
494576077751115507409
2CC40F23B207A6__no
2017-11-19T12:22:38kkmrkkblmbrbkc4.xlarge
494576077751115507409
2CC40F23B207A6__no


P-1 factor-bounds graph:
B1 = 580000, B2 = 15080000 (P-1 stage 2)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 580000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
B1 = 100000, B2 = 2000000 (P-1 stage 2)
B1 = 200238 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 10000 (P-1 stage 1)
B1 = 6000 (P-1 stage 1)
B1 = 4000 (P-1 stage 1)
B1 = 2048 (P-1 stage 1)
B1 = 2000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-05-07T05:55:36+00:00