is 2 2981533 - 1
has 897531 decimal digits
takes 0.254 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LA430099B3DA46C6Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2679.966067.1642%9500019950000.02452.7701%9.990568.0738%0.9096%
PrimeNet2600.051563.3333%120002200000.00292.5122%0.054464.2545%0.9212%
GPU722641.193865.6250%130002000000.00291.3852%1.196766.1012%0.4762%
Difference+3+8.7722+1.5392%+82000+1795000+0.0216+1.3848%+8.7938+1.9726%+1.9726%

Known prime factors (1 factor, 75.4 bits, 0.00252922% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2981533501787049619489078569992375.4098414916917228303
8414916917228303
2016-01-10184149169172283034,245.856,580,031105,675,742

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-12-13T00:00:00ANONYMOUSv4_computers2048204800---0.002--0.306%
2003-12-23T00:00:00Team Prime Ribv4_computers1000010000---0.001--0.177%
2010-10-25T09:59:00markrtiny950001995000---0.024--2.770%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-05-09T00:00:00ANONYMOUSv4_computers21260--0.052--
2009-02-13T05:44:00Sturle Sundegorilla.ifi260261--0.052--
2011-11-25T23:12:00Sebastian HornbostelManual testing261262--0.103--
2013-01-07T13:51:00dbaughManual testing262263--0.329--
2015-04-13T19:44:00lycornManual testing263264--0.658--
2015-04-13T19:44:00lycornManual testing264265--1.253--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.160 GHz-days
Estimated T-Level:0.500
DigitsB1CurvesCompleteFacMiss
201100010 / 1000.10090.438%
255000010 / 2800.03696.485%

New Calculation Method

Total ECM effort:1.160 GHz-days
Estimated T-Level:0.500
DigitsB1CompleteFacMiss
20110000.32372.428%
25500000.02997.127%
302500000.00299.821%


ECM Summary

B1B2factorcurvesGHz-days
50000500000091.044
50000500000010.116


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-08-16T00:00:00ANONYMOUSv4_computersA430099B3DA46C6D0.254


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-30T15:33:05alpertronManual testing
50178704961948907856999
9C04AF7DC1B0A7__no
2017-11-18T03:11:19Oliver KruseGTX-2
50178704961948907856999
9C04AF7DC1B0A7__no


P-1 factor-bounds graph:
B1 = 95000, B2 = 1995000 (P-1 stage 2)
B1 = 95000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 10000 (P-1 stage 1)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2017-11-18T03:11:19+00:00