is 2 128437 - 1
has 38664 decimal digits
takes 0.000 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
Actual267231.350174.6269%10000000020000000000.770511.9406%232.120777.6566%3.0297%
PrimeNet2400.000057.5000%1400260000.00009.5492%0.000061.5584%4.0584%
GPU722440.000061.3636%2200400000.00006.3381%0.000063.8124%2.4488%
Difference+23+231.3501+13.2632%+99997800+1999960000+0.7705+5.6025%+232.1206+13.8441%+13.8441%

Known prime factors (1 factor, 60.1 bits, 0.04676665% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
12843712066291949159625271960.0664697358218099
43 × 109240888793
2007-10-03431092408887931.257722.53442.087

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2000-11-25T00:00:00ANONYMOUSv4_computers100000025000000---0.009--4.415%
2002-06-02T00:00:00ANONYMOUSv4_computers327683276800---0.001--1.376%
2002-07-20T00:00:00ANONYMOUSv4_computers655366553600---0.002--2.004%
2003-02-09T00:00:00ANONYMOUSv4_computers13107213107200---0.003--2.760%
2003-09-29T00:00:00ANONYMOUSv4_computers26214426214400---0.006--3.633%
2017-03-31T15:23:25kkmrkkblmbrbkManual testing100000000200000000012---0.771--11.941%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-09-22T00:00:00ANONYMOUSv4_computers252253--0.005--
2000-04-19T00:00:00ANONYMOUSv4_computers21254--0.019--
2022-03-07T03:14:24LordJuliusManual testing254255--0.019--
2000-12-31T00:00:00ANONYMOUSv4_computers21256--0.075--
2002-06-09T00:00:00ANONYMOUSv4_computers21257--0.149--


ECM factoring results:

Old Calculation Method

Total ECM effort:11.543 GHz-days
Estimated T-Level:29.961
DigitsB1CurvesCompleteFacMiss
2011000911 / 1009.1100.011%
2550000911 / 2803.2543.841%
30250000635 / 6400.99237.048%
35100000051 / 15660.03396.795%

New Calculation Method

Total ECM effort:11.543 GHz-days
Estimated T-Level:29.961
DigitsB1CompleteFacMiss
201100072.2060.000%
255000010.9080.002%
302500001.23329.139%
3510000000.11389.354%
4030000000.00999.135%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
5000050000002760.756
250000250000005847.994
1000000100000000512.793


Lucas-Lehmer results:
No L-L results for M128437


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-21T21:51:25Oliver KruseOllaptop
1206629194915962527
9AC686998206F6__no
2017-09-22T10:01:28Oliver KruseManual testing
1206629194915962527
9AC686998206F6__no
2017-10-13T19:02:32kkmrkkblmbrbkManual testing
1206629194915962527
9AC686998206F6__no
2020-04-17T15:37:21Oliver KruseAddPrpType5
1206629194915962527
D626DC30198C3B__no


P-1 factor-bounds graph:
B1 = 100000000, B2 = 2000000000 (P-1 stage 2)
B1 = 100000000 (P-1 stage 1)
B1 = 1000000, B2 = 25000000 (P-1 stage 2)
B1 = 262144, B2 = 26214400 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 131072, B2 = 13107200 (P-1 stage 2)
B1 = 65536, B2 = 6553600 (P-1 stage 2)
B1 = 262144 (P-1 stage 1)
B1 = 32768, B2 = 3276800 (P-1 stage 2)
B1 = 131072 (P-1 stage 1)
B1 = 65536 (P-1 stage 1)
B1 = 32768 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-03-07T03:14:24+00:00