is 2 1865987 - 1
has 561719 decimal digits
takes 0.101 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.924068.6567%500000150000000.10155.0805%16.025470.2491%1.5924%
PrimeNet2570.010363.1579%90001600000.00143.0279%0.011664.2734%1.1155%
GPU722610.164665.5738%100001500000.00141.6889%0.166066.1552%0.5814%
Difference+6+15.7593+3.0829%+490000+14850000+0.1001+3.3916%+15.8594+4.0939%+4.0939%

Known prime factors (3 factors, 164.1 bits, 0.00879531% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1865987107054659769211443.2832868580
22 × 5 × 11 × 13 × 17 × 59
-17591.196e-61.517e-62.722e-6
186598744302899767526231651.9761187117053
1187117053
2014-07-18111871170530.00035.08779.502
18659875355797363937774288232168.860143511111383353
72 × 3137 × 933630281
2021-03-17313793363028161.9904.00157.4733

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1865987474283186140193335638442137832995.260
1865987573363064589190213960005723819398334112.143
1865987237277353789716415963348432806105272937120.836
18659872540164638089656192624618729540926110719567806740950164.119
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:37:31alpertronManual testing5000001500000012-
skipped known factor: 10705465976921
--0.101--5.080%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2014-07-18T11:29:00ANONYMOUSManual testing??51.976160.0000.2160.000


ECM factoring results:

Old Calculation Method

Total ECM effort:19.768 GHz-days
Estimated T-Level:24.625
DigitsB1CurvesCompleteFacMiss
2011000259 / 1002.5907.405%
2550000259 / 2800.92539.588%

New Calculation Method

Total ECM effort:19.768 GHz-days
Estimated T-Level:24.625
DigitsB1CompleteFacMiss
20110008.8180.015%
25500000.79944.992%
302500000.04995.180%
3510000000.00299.773%


ECM Summary

B1B2factorcurvesGHz-days
500005000000493.392
50000500000020.138
50000660000020816.24


Lucas-Lehmer results:
No L-L results for M1865987


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T10:07:52Oliver KruseGTX-0
10705465976921
4430289976752623
698B9AD248AEDC__no
2017-11-07T15:45:06kkmrkkblmbrbkold
10705465976921
4430289976752623
698B9AD248AEDC__no
2021-03-18T05:38:33NescroManual testing
10705465976921
4430289976752623
535579736393777428823
6BB1CB8953092452no
2021-03-18T10:44:56Oliver KruseThreadripper-PC
10705465976921
4430289976752623
535579736393777428823
6BB1CB8953092452no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
267
2
240
250
260
270
280
290
2100
Last modified: 2021-11-11T10:32:46+00:00