is 2 1646101 - 1
has 495526 decimal digits
takes 0.074 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LF4DED17CF261C4E8double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26718.051168.6567%500000150000000.08355.0043%18.134670.2252%1.5685%
PrimeNet2570.011763.1579%70001200000.00092.5623%0.012564.1019%0.9440%
GPU722610.186665.5738%6500800000.00071.1715%0.187365.9771%0.4033%
Difference+6+17.8645+3.0829%+493500+14920000+0.0829+3.8328%+17.9473+4.2481%+4.2481%

Known prime factors (1 factor, 79.1 bits, 0.00480791% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
16461016674400734041582958554632479.143202733633417438631
3 × 41 × 21871 × 75361936907
2011-09-222187175361936907106,109265.93496.68

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:17:49alpertronManual testing5000001500000012---0.084--5.004%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-07T00:00:00ANONYMOUSv4_computers21257--0.012--
2003-05-26T00:00:00ANONYMOUSv4_computers21258--0.023--
2010-04-29T00:50:00Architects Cubedm1_76l260261--0.093--
2010-08-03T22:36:00GrunwalderGIMPManual testing21263--0.970--


ECM factoring results:

Old Calculation Method

Total ECM effort:14.057 GHz-days
Estimated T-Level:24.464
DigitsB1CurvesCompleteFacMiss
2011000250 / 1002.5008.106%
2550000250 / 2800.89340.883%

New Calculation Method

Total ECM effort:14.057 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
50000500000025014.06


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-06T00:00:00ANONYMOUSv4_computersF4DED17CF261C4E80.074


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-02T17:49:20Oliver KruseGTX-2
667440073404158295855463
D025FDBBABB7C3__no
2017-11-02T05:09:26kkmrkkblmbrbkc4.xlarge
667440073404158295855463
D025FDBBABB7C3__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
267
263
261
258
257
250
260
270
280
290
2100
Last modified: 2019-11-11T13:14:11+00:00