is 2 1535581 - 1
has 462256 decimal digits
takes 0.069 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L1974360A2D9AF637double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26719.350368.6567%500000150000000.08354.9624%19.433870.2121%1.5554%
PrimeNet2570.012563.1579%65001100000.00082.4160%0.013364.0480%0.8901%
GPU722610.200065.5738%6500550000.00061.0150%0.200665.9232%0.3494%
Difference+6+19.1502+3.0829%+493500+14945000+0.0830+3.9474%+19.2332+4.2889%+4.2889%

Known prime factors (1 factor, 70.2 bits, 0.00457035% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
153558113388629401497628077992270.181435946700353079
367 × 719 × 1652108023
2009-04-177191652108023183.895.829810.888

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-29T00:00:00Team Prime Ribv4_computers20000290000---0.002--0.992%
2016-03-17T19:16:02alpertronManual testing5000001500000012---0.084--4.962%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-10-18T00:00:00Dry Creek Photov4_computers21257--0.013--
2003-08-08T00:00:00ANONYMOUSv4_computers21258--0.025--


ECM factoring results:

Old Calculation Method

Total ECM effort:13.960 GHz-days
Estimated T-Level:24.464
DigitsB1CurvesCompleteFacMiss
2011000250 / 1002.5008.106%
2550000250 / 2800.89340.883%

New Calculation Method

Total ECM effort:13.960 GHz-days
Estimated T-Level:24.464
DigitsB1CompleteFacMiss
20110009.6150.007%
25500000.89041.079%
302500000.05694.543%
3510000000.00399.738%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000025013.96


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-10-25T00:00:00Dry Creek Photov4_computers1974360A2D9AF6370.069


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-01T15:51:26Oliver KruseGTX-2
1338862940149762807799
B258DC9A03F997__no
2017-10-30T08:33:55kkmrkkblmbrbkold
1338862940149762807799
B258DC9A03F997__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 20000, B2 = 290000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
267
258
257
250
260
270
280
290
2100
Last modified: 2019-06-21T09:35:22+00:00