is 2 2036387 - 1
has 613014 decimal digits
takes 0.134 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
Actual26714.591568.6567%500000150000000.12305.1342%14.714570.2659%1.6092%
PrimeNet2580.018963.7931%90001600000.00162.6623%0.020564.7570%0.9639%
GPU722620.301766.1290%90001200000.00141.3285%0.303166.5790%0.4500%
Difference+5+14.2898+2.5277%+491000+14880000+0.1216+3.8057%+14.4113+3.6869%+3.6869%

Known prime factors (1 factor, 38.7 bits, 0.00190176% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
20363874550266023771238.727111724
22 × 17 × 31 × 53
-31532.127e-83.070e-66.015e-6

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:19:48alpertronManual testing5000001500000012-
skipped known factor: 455026602377
--0.123--5.134%


Trial Factoring results:
No TF results for M2036387


ECM factoring results:

Old Calculation Method

Total ECM effort:3.755 GHz-days
Estimated T-Level:2.050
DigitsB1CurvesCompleteFacMiss
201100041 / 1000.41066.228%
255000041 / 2800.14686.356%

New Calculation Method

Total ECM effort:3.755 GHz-days
Estimated T-Level:2.050
DigitsB1CompleteFacMiss
20110001.64419.316%
25500000.15385.850%
302500000.01099.037%


ECM Summary

B1B2factorcurvesGHz-days
500005000000201.695
50000675000070.678
50000690000070.685
50000715000070.697


Lucas-Lehmer results:
No L-L results for M2036387


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-06T04:20:11Oliver KruseGTX-2
455026602377
414E9A2248A02A__no
2017-11-14T17:52:49kkmrkkblmbrbkc4.xlarge
455026602377
414E9A2248A02A__no


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
TF factor-bounds graph:
267
230
240
250
260
270
280
290
2100
Last modified: 2022-07-18T00:55:23+00:00