is 2 2571937 - 1
has 774231 decimal digits
takes 0.178 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LB98AA7CB0174C18Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26711.553167.1642%150002025000.00250.8911%11.555767.4568%0.2926%
PrimeNet2590.029962.7119%110002000000.00212.6895%0.032063.7147%1.0029%
GPU722630.620665.0794%120001900000.00221.5043%0.622765.6047%0.5253%
Difference+4+10.9326+2.0848%+3000+12500+0.0004-0.6133%+10.9329+1.8521%+1.8521%

Known prime factors (1 factor, 66.8 bits, 0.00259814% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
25719371304865331061250827512166.82225367365745375
53 × 937 × 216583699
2009-02-189372165836997.82381.18692.2166

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-31T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.293%
2003-11-08T00:00:00Team Prime Ribv4_computers15000202500---0.003--0.891%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-07T00:00:00ANONYMOUSv4_computers21258--0.015--
1999-10-29T00:00:00ANONYMOUSv4_computers21258--0.015--
1999-03-26T00:00:00Ian Lowmanv4_computers21259--0.030--
2022-03-11T02:05:01LordJuliusManual testing21260--0.060--
2009-01-30T18:35:00Sturle Sundescarpia.ifi260261--0.060--


ECM factoring results:

Old Calculation Method

Total ECM effort:0.277 GHz-days
Estimated T-Level:0.150
DigitsB1CurvesCompleteFacMiss
20110003 / 1000.03097.030%
25500003 / 2800.01198.932%

New Calculation Method

Total ECM effort:0.277 GHz-days
Estimated T-Level:0.150
DigitsB1CompleteFacMiss
20110000.11589.102%
25500000.01198.938%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000030.277


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-07T00:00:00ANONYMOUSv4_computersB98AA7CB0174C18D0.178
1999-04-13T00:00:00Ian Lowmanv4_computersB98AA7CB0174C18D0.178
1999-10-29T00:00:00ANONYMOUSv4_computersB98AA7CB0174C18D0.178


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-15T07:57:38Oliver KruseGTX-0
130486533106125082751
4906E2530E74AF__no
2017-12-01T22:11:07kkmrkkblmbrbkc4.xlarge
130486533106125082751
4906E2530E74AF__no


P-1 factor-bounds graph:
B1 = 15000, B2 = 202500 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
101
102
103
104
105
101
102
103
104
105
106
107
108
109
TF factor-bounds graph:
267
261
260
259
258
250
260
270
280
290
2100
Last modified: 2022-03-11T02:05:01+00:00