is 2 195761 - 1
has 58930 decimal digits
takes 0.001 GHz-days to do one PRP test
Last-known PrimeNet details:
Assigned as ecm on 2022-08-18, 0.0% done, ETC 2022-08-19
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actualunknown10000000020000000001.360749.5237%1.360749.5237%49.5237%
PrimeNet2400.000055.0000%2200500000.000012.6031%0.000060.6714%5.6714%
GPU722440.000059.0909%3600800000.00018.8339%0.000162.7048%3.6139%
Difference-440.0000-59.0909%+99996400+1999920000+1.3607+40.6899%+1.3607-13.1810%-13.1810%

Known prime factors (1 factor, 41.4 bits, 0.02114381% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
19576128842564391611341.3917366780
22 × 5 × 17 × 47 × 461
-474612.306e-64.651e-76.395e-7

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2017-06-09T20:25:32kkmrkkblmbrbkManual testing100000000200000000012-
skipped known factor: 2884256439161
--1.361--42.005%


Trial Factoring results:
No TF results for M195761


ECM factoring results:

Old Calculation Method

Total ECM effort:12.558 GHz-days
Estimated T-Level:28.516
DigitsB1CurvesCompleteFacMiss
2011000731 / 1007.3100.064%
2550000731 / 2802.6117.314%
30250000450 / 6400.70349.476%

New Calculation Method

Total ECM effort:12.558 GHz-days
Estimated T-Level:28.516
DigitsB1CompleteFacMiss
201100052.2080.000%
25500007.4030.061%
302500000.77146.247%
3510000000.06393.896%
4030000000.00499.582%


ECM Summary

B1B2factorcurvesGHz-days
5000050000002811.371
250000250000003969.66
2500003125000070.185
2500003600000070.196
2500003800000070.200
25000038500000280.805
2500003850000050.144


Lucas-Lehmer results:
No L-L results for M195761


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-22T01:51:54Oliver KruseOllaptop
2884256439161
744DB5DBA03514__no
2017-09-22T10:02:18Oliver KruseManual testing
2884256439161
744DB5DBA03514__no
2017-09-22T10:02:21Oliver KruseManual testing
2884256439161
744DB5DBA03514__no
2017-11-06T16:07:55kkmrkkblmbrbkc4.xlarge
2884256439161
744DB5DBA03514__no
2020-04-17T19:05:23Oliver KruseAddPrpType5
2884256439161
64FACF814FF50E__no


P-1 factor-bounds graph:
B1 = 100000000, B2 = 2000000000 (P-1 stage 2)
B1 = 100000000 (P-1 stage 1)
100
101
102
103
104
105
106
107
108
100
101
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
240
250
260
270
280
290
2100
Last modified: 2022-08-18T20:45:03+00:00