is 2 1460021 - 1
has 439511 decimal digits
takes 0.056 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LEA1920A0F16D7D70double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26720.351768.6567%1000000300000000.14286.0375%20.494570.5491%1.8924%
PrimeNet2560.006662.5000%70001200000.00072.9080%0.007363.5905%1.0905%
GPU722600.105265.0000%6500900000.00061.3985%0.105865.4895%0.4895%
Difference+7+20.2465+3.6567%+993500+29910000+0.1422+4.6390%+20.3887+5.0596%+5.0596%

Known prime factors (1 factor, 79.8 bits, 0.00546789% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
146002110763402007773202268736392579.832368604355956976039
17 × 373 × 89867 × 646848337
2013-09-118986764684833791,8251.95583.6440

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-29T00:00:00Team Prime Ribv4_computers15000243750---0.002--0.840%
2008-12-27T18:27:00axnManual testing100000030000000---0.143--6.038%
2016-03-17T19:14:37alpertronManual testing5000001500000012---0.071--4.932%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-07-21T00:00:00ANONYMOUSv4_computers21258--0.026--
2010-04-15T16:04:00Richard B. WoodsPuttputt260261--0.105--
2011-04-05T20:59:00GrunwalderGIMPManual testing21263--1.093--


ECM factoring results:

Old Calculation Method

Total ECM effort:25.422 GHz-days
Estimated T-Level:25.391
DigitsB1CurvesCompleteFacMiss
2011000298 / 1002.9805.004%
2550000298 / 2801.06434.432%
3025000050 / 6400.07892.479%

New Calculation Method

Total ECM effort:25.422 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100012.1670.001%
25500001.34825.975%
302500000.11289.363%
3510000000.00899.239%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000024811.75
250000350000005013.67


Lucas-Lehmer results:
No L-L results for M1460021


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-01T03:01:44Oliver KruseGTX-1
1076340200777320226873639
30A5EA435132F1__no
2017-10-27T19:42:18kkmrkkblmbrbkc4.xlarge
1076340200777320226873639
30A5EA435132F1__no


P-1 factor-bounds graph:
B1 = 1000000, B2 = 30000000 (P-1 stage 2)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
B1 = 15000, B2 = 243750 (P-1 stage 2)
B1 = 15000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
109
TF factor-bounds graph:
267
263
261
258
250
260
270
280
290
2100
Last modified: 2021-12-28T11:13:26+00:00