is 2 1540171 - 1
has 463638 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-LC4AAA1D66242D483double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26719.292668.6567%500000150000000.08354.9642%19.376270.2127%1.5559%
PrimeNet2570.012563.1579%65001100000.00082.4174%0.013364.0485%0.8906%
GPU722610.199465.5738%6500550000.00061.0157%0.200065.9234%0.3497%
Difference+6+19.0932+3.0829%+493500+14945000+0.0830+3.9485%+19.1761+4.2892%+4.2892%

Known prime factors (1 factor, 70.3 bits, 0.00456719% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
154017114969875012156883113512270.343485980940173425
3 × 52 × 1021 × 6346469999
2013-09-1110216346469999188.9222.39541.827

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-29T00:00:00Team Prime Ribv4_computers20000290000---0.002--0.992%
2011-02-02T13:05:00James HeinrichWHS800001340000---0.010--2.196%
2016-03-17T19:16:06alpertronManual testing5000001500000012---0.084--4.964%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-10-18T00:00:00ANONYMOUSv4_computers21257--0.012--
2003-08-08T00:00:00ANONYMOUSv4_computers21258--0.025--
2022-03-08T19:54:25LordJuliusManual testing258260--0.075--
2022-03-09T01:21:17LordJuliusManual testing21260--0.100--
2010-04-26T20:20:00Architects Cubeda3_bu2260261--0.100--
2010-05-12T20:11:00GrunwalderGIMPManual testing21263--1.036--


ECM factoring results:

Old Calculation Method

Total ECM effort:13.853 GHz-days
Estimated T-Level:24.429
DigitsB1CurvesCompleteFacMiss
2011000248 / 1002.4808.270%
2550000248 / 2800.88641.177%

New Calculation Method

Total ECM effort:13.853 GHz-days
Estimated T-Level:24.429
DigitsB1CompleteFacMiss
20110008.0000.034%
25500000.72348.528%
302500000.04595.645%
3510000000.00299.796%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000024813.85


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-10-25T00:00:00ANONYMOUSv4_computersC4AAA1D66242D4830.069


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-01T16:43:57Oliver KruseGTX-1
1496987501215688311351
262ACBB66C2B25__no
2017-11-10T14:41:20kkmrkkblmbrbkc4.xlarge
1496987501215688311351
262ACBB66C2B25__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 80000, B2 = 1340000 (P-1 stage 2)
B1 = 80000 (P-1 stage 1)
B1 = 20000, B2 = 290000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
267
263
261
260
258
257
250
260
270
280
290
2100
Last modified: 2022-03-09T01:21:17+00:00