is 2 1903387 - 1
has 572977 decimal digits
takes 0.103 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
Actual26715.611168.6567%500000150000000.10155.0926%15.712570.2529%1.5962%
PrimeNet2570.010163.1579%90001600000.00143.0390%0.011464.2775%1.1196%
GPU722610.161465.5738%100001600000.00141.7280%0.162866.1686%0.5949%
Difference+6+15.4497+3.0829%+490000+14840000+0.1000+3.3647%+15.5497+4.0843%+4.0843%

Known prime factors (2 factors, 139.1 bits, 0.00730848% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1903387998179690962189111756.47026221143965
5 × 5244228793
-552442287930.006522.47541.978
190338775274100934195909150275932582.6381977372466403204108
22 × 7 × 29 × 2435187766506409
2020-09-06292435187766506409969,92710,436,60619,492,674

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
190338775137078807952303178814721612806553341122342139.109
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:40:54alpertronManual testing5000001500000012---0.101--5.093%


Trial Factoring results:
No TF results for M1903387


ECM factoring results:

Old Calculation Method

Total ECM effort:20.943 GHz-days
Estimated T-Level:24.589
DigitsB1CurvesCompleteFacMiss
2011000257 / 1002.5707.555%
2550000257 / 2800.91839.872%

New Calculation Method

Total ECM effort:20.943 GHz-days
Estimated T-Level:24.589
DigitsB1CompleteFacMiss
20110009.0660.012%
25500000.80644.672%
302500000.05095.126%
3510000000.00299.770%


ECM Summary

B1B2factorcurvesGHz-days
500005000000251.734
50000500000050.347
50000675000070.554
50000715000070.569
50000750000021317.74


Lucas-Lehmer results:
No L-L results for M1903387


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T19:33:11Oliver KruseGTX-3
99817969096218911
1733A3A9D6BDF1__no
2017-11-09T09:41:06kkmrkkblmbrbkc4.large
99817969096218911
1733A3A9D6BDF1__no
2020-09-06T22:01:36Richard Thomasdjinn.ubuntu
99817969096218911
7527410093419590915027593
6C951369379AAB__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-01-06T11:59:20+00:00