is 2 2061149 - 1
has 620468 decimal digits
takes 0.136 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LAC29E1ECF09A3485double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26714.416268.6567%500000150000000.12305.1416%14.539270.2683%1.6116%
PrimeNet2580.018663.7931%90001600000.00162.6684%0.020364.7592%0.9661%
GPU722620.298166.1290%90001300000.00151.3651%0.299666.5914%0.4624%
Difference+5+14.1181+2.5277%+491000+14870000+0.1215+3.7765%+14.2396+3.6769%+3.6769%

Known prime factors (1 factor, 67.6 bits, 0.00327987% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
20611492241551914843904550732167.60354376270586064
24 × 35 × 7 × 30553 × 65393
2008-12-09305536539315.9980.00310.0059

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-02-24T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.275%
2016-03-16T13:42:43alpertronManual testing5000001500000012-
skipped known factor: 224155191484390455073
--0.123--5.142%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-10T00:00:00ANONYMOUSv4_computers21258--0.019--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.641 GHz-days
Estimated T-Level:1.900
DigitsB1CurvesCompleteFacMiss
201100038 / 1000.38068.255%
255000038 / 2800.13687.288%

New Calculation Method

Total ECM effort:3.641 GHz-days
Estimated T-Level:1.900
DigitsB1CompleteFacMiss
20110001.52521.757%
25500000.13986.988%
302500000.00999.128%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
500005000070.355
500005000000242.038
50000560000070.623
50000564590370.625


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-07T00:00:00ANONYMOUSv4_computersAC29E1ECF09A34850.136


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-06T10:57:59Oliver KruseGTX-2
224155191484390455073
8C0D883AB3C16B__no
2017-11-15T23:57:59kkmrkkblmbrbkc4.xlarge
224155191484390455073
8C0D883AB3C16B__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
102
103
104
105
106
102
103
104
105
106
107
108
TF factor-bounds graph:
267
258
250
260
270
280
290
2100
Last modified: 2022-08-10T09:38:01+00:00