is 2 2437531 - 1
has 733770 decimal digits
takes 0.165 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L5AE6DE7C24798555double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26712.190267.1642%1988120695841800.55557.8070%12.745769.7277%2.5635%
PrimeNet2590.031562.7119%100001800000.00192.5258%0.033463.6537%0.9418%
GPU722630.654865.0794%100001500000.00171.3062%0.656565.5355%0.4561%
Difference+4+11.5354+2.0848%+1978120+69434180+0.5538+6.5008%+12.0892+4.1922%+4.1922%

Known prime factors (1 factor, 84.2 bits, 0.00345507% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2437531225030605755474323124628172684.2184615953720290620368
24 × 3 × 35323993 × 2722390487
2017-04-243532399327223904872,667,71717.80127.136

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-14T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.289%
2003-10-31T00:00:00Team Prime Ribv4_computers15000217500---0.003--0.901%
2010-11-17T11:35:00Jocelyn LaroucheManual testing2000020000---0.002--0.312%
2011-01-10T10:20:00Oscar Östlin950001923750---0.019--2.664%
2014-05-12T19:31:00mikrMSI198812069584180---0.556--7.807%
2018-09-28T17:00:27alpertronManual testing20000006000000012---0.505--7.627%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-15T00:00:00Ethan O'Connorv4_computers21259--0.032--
2016-02-23T16:29:14Mark RoseManual testing259260--0.032--
2009-01-10T20:36:00Sturle Sundegoober.ifi260261--0.063--
2012-06-05T23:42:00Sebastian HornbostelManual testing261262--0.126--
2013-01-23T08:28:00dbaughManual testing262263--0.403--
2015-02-27T20:41:00VictordeHollanderManual testing263264--0.805--
2015-02-27T20:41:00VictordeHollanderManual testing264265--1.533--
2015-10-25T20:35:01ramgeisManual testing265266--3.066--


ECM factoring results:

Old Calculation Method

Total ECM effort:2.230 GHz-days
Estimated T-Level:1.250
DigitsB1CurvesCompleteFacMiss
201100025 / 1000.25077.782%
255000025 / 2800.08991.444%

New Calculation Method

Total ECM effort:2.230 GHz-days
Estimated T-Level:1.250
DigitsB1CompleteFacMiss
20110000.80644.644%
25500000.07392.971%
302500000.00499.552%


ECM Summary

B1B2factorcurvesGHz-days
500005000000242.141
50000500000010.089


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-15T00:00:00Ethan O'Connorv4_computers5AE6DE7C247985550.165


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-13T12:28:26Oliver KruseGTX-39ECF41500E8A51__no
2017-11-27T17:24:41ATHec2-1xf
22503060575547432312462817
9ECF41500E8A51__no


P-1 factor-bounds graph:
B1 = 1988120, B2 = 69584180 (P-1 stage 2)
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 1988120 (P-1 stage 1)
B1 = 95000, B2 = 1923750 (P-1 stage 2)
B1 = 95000 (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)
102
103
104
105
106
107
108
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
267
266
265
264
263
262
261
260
259
250
260
270
280
290
2100
Last modified: 2018-09-28T17:00:27+00:00