is 2 1848877 - 1
has 556568 decimal digits
takes 0.100 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LF440F27B3770E8A9double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.071368.6567%500000283586457012.191010.3831%28.262371.9111%3.2544%
PrimeNet2570.010463.1579%90001600000.00143.0228%0.011764.2715%1.1136%
GPU722610.166165.5738%90001500000.00131.6308%0.167566.1352%0.5614%
Difference+6+15.9052+3.0829%+491000+2835714570+12.1897+8.7523%+28.0949+5.7759%+5.7759%

Known prime factors (2 factors, 175.6 bits, 0.00949610% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
18488772474048424399557885845612477.71166906787860943640
23 × 5 × 17 × 98392335089623
2020-12-01179839233508962332,537421,685787,590
18488772875924129944769886539300611193097.86077774890648344099865467
3 × 23 × 38453 × 35436481 × 827198051
2011-01-26354364818271980513.257e+106.18086.6214

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
184887771151755623825273100483231173767860499027817229783
759
53175.571
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2022-04-11T18:51:32Lisander ViaeneDesktop5000002835864570---12.19--10.383%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-16T00:00:00ANONYMOUSv4_computers21258--0.021--
2010-04-08T13:19:00Architects CubedManual testing260261--0.083--
2011-01-21T16:11:00GrunwalderGIMPManual testing21263--0.863--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.669 GHz-days
Estimated T-Level:24.571
DigitsB1CurvesCompleteFacMiss
2011000256 / 1002.5607.631%
2550000256 / 2800.91440.015%

New Calculation Method

Total ECM effort:19.669 GHz-days
Estimated T-Level:24.571
DigitsB1CompleteFacMiss
20110008.7540.016%
25500000.79345.245%
302500000.04995.212%
3510000000.00299.775%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
500005000000261.798
50000500000070.484
50000660000022317.39


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-21T00:00:00ANONYMOUSv4_computersF440F27B3770E8A90.100


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T05:42:32Oliver KruseGTX-1
287592412994476988653930061119
6B4F63C80447A3__no
2017-11-06T21:37:02ATHec2-1xf
287592412994476988653930061119
6B4F63C80447A3__no
2020-12-04T09:42:01Jinyuan WangManual testing
247404842439955788584561
287592412994476988653930061119
19B15F6E5544FE__no
2020-12-06T05:38:24roemer2201ws-rebentrost-o
247404842439955788584561
287592412994476988653930061119
19B15F6E5544FEDAno


P-1 factor-bounds graph:
B1 = 500000, B2 = 2835864570 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-04-11T18:51:32+00:00