is 2 1878803 - 1
has 565577 decimal digits
takes 0.102 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
Actual26715.815368.6567%500000150000000.10155.0847%15.916870.2504%1.5937%
PrimeNet2570.010263.1579%90001600000.00143.0317%0.011664.2748%1.1170%
GPU722610.163565.5738%100001500000.00141.6912%0.164966.1560%0.5822%
Difference+6+15.6518+3.0829%+490000+14850000+0.1001+3.3934%+15.7519+4.0944%+4.0944%

Known prime factors (2 factors, 110.8 bits, 0.00589814% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1878803226395761511134.3986025
52 × 241
-252411.589e-92.892e-64.002e-6
18788031008353754986777665955272476.41626835004920334321
12893 × 2081362360997
2020-10-1312893208136236099716,1878,920.216,660

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1878803228287016231699489665003753247657734110.814
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:39:10alpertronManual testing5000001500000012-
skipped known factor: 22639576151
--0.101--5.085%


Trial Factoring results:
No TF results for M1878803


ECM factoring results:

Old Calculation Method

Total ECM effort:19.803 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:19.803 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
20110008.8120.015%
25500000.79845.036%
302500000.04995.185%
3510000000.00299.773%


ECM Summary

B1B2factorcurvesGHz-days
50000470000070.473
500005000000241.663
50000500000070.485
50000639229070.539
50000660000021316.64


Lucas-Lehmer results:
No L-L results for M1878803


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T13:16:39Oliver KruseGTX-3
22639576151
1FFE71957630C3__no
2017-11-08T02:47:08ATHec2-1xf
22639576151
1FFE71957630C3__no
2020-10-13T18:53:26mrh.orgx
22639576151
100835375498677766595527
3BB4A6FF2D42E961no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
101
102
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106
100
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102
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1010
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TF factor-bounds graph:
267
230
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2100
Last modified: 2021-11-04T11:47:08+00:00