is 2 2090251 - 1
has 629229 decimal digits
takes 0.137 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L8366724FEFBDAEDDdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26714.215568.6567%500000150000000.12305.1503%14.338570.2710%1.6143%
PrimeNet2580.018463.7931%90001600000.00162.6754%0.020064.7618%0.9687%
GPU722620.293966.1290%90001400000.00151.4003%0.295566.6033%0.4743%
Difference+5+13.9216+2.5277%+491000+14860000+0.1214+3.7500%+14.0430+3.6677%+3.6677%

Known prime factors (1 factor, 75.7 bits, 0.00361945% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2090251595143302473771282451832375.65614236168347097341
3 × 4745389449032447
2009-01-08347453894490324477,100.524,648,73946,036,981

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-27T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.276%
2016-03-16T13:43:50alpertronManual testing5000001500000012---0.123--5.150%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-17T00:00:00ANONYMOUSv4_computers21258--0.018--
2022-03-09T08:46:54LordJuliusManual testing21260--0.073--
2009-01-02T20:58:00Sturle Sundekorsmo.ifi260261--0.073--


ECM factoring results:

Old Calculation Method

Total ECM effort:2.766 GHz-days
Estimated T-Level:1.550
DigitsB1CurvesCompleteFacMiss
201100031 / 1000.31073.230%
255000031 / 2800.11189.502%

New Calculation Method

Total ECM effort:2.766 GHz-days
Estimated T-Level:1.550
DigitsB1CompleteFacMiss
20110001.22629.361%
25500000.11389.283%
302500000.00799.285%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
500005000000171.446
50000580529770.634
50000687110470.686


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-07T00:00:00ANONYMOUSv4_computers8366724FEFBDAEDD0.137


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-06T21:35:04Oliver KruseGTX-2
59514330247377128245183
7343AD4B8A1D08__no
2017-11-17T00:24:12kkmrkkblmbrbkold
59514330247377128245183
7343AD4B8A1D08__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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2100
Last modified: 2022-07-13T15:40:44+00:00