is 2 308773 - 1
has 92950 decimal digits
takes 0.002 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L1BEF992FFE5706F5double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual268193.037972.0588%10000000020000000002.098511.9555%195.136375.3993%3.3405%
PrimeNet2400.000052.5000%3200900000.000115.6279%0.000159.9232%7.4232%
GPU722440.000056.8182%55001500000.000111.4395%0.000161.7580%4.9398%
Difference+24+193.0378+15.2406%+99994500+1999850000+2.0984+0.5160%+195.1362+13.6413%+13.6413%

Known prime factors:
No known factors for M308773

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-06-30T00:00:00ANONYMOUSv4_computers110001100000---0.001--0.675%
2001-10-13T00:00:00ANONYMOUSv4_computers500001000000---0.001--1.210%
2002-06-09T00:00:00ANONYMOUSv4_computers327683276800---0.002--1.404%
2002-08-10T00:00:00ANONYMOUSv4_computers655366553600---0.004--2.037%
2003-03-27T00:00:00ANONYMOUSv4_computers13107213107200---0.009--2.798%
2006-01-15T00:00:00Jocelyn Larouchev4_computers308773308773---0.003--1.062%
2008-11-17T23:58:00GrunwalderGIMPGWPrime022000000200000000---0.132--6.820%
2012-08-22T11:16:00alpertronManual testing10000000200000000---0.210--7.791%
2012-10-31T11:32:00alpertronManual testing1000000002000000000---2.098--11.955%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2000-04-12T00:00:00ANONYMOUSv4_computers21254--0.008--
2022-03-07T06:36:00LordJuliusManual testing254255--0.008--
2001-03-05T00:00:00ANONYMOUSv4_computers21256--0.031--
2002-02-24T00:00:00ANONYMOUSv4_computers21257--0.062--
2004-02-07T00:00:00ANONYMOUSv4_computers21258--0.124--
2008-12-31T08:30:00Sturle Sundegassmann.ifi258259--0.124--
2009-01-24T00:12:00Sturle Sundegicy.ifi259260--0.249--
2012-04-25T11:44:00David CampeauManual testing260261--0.497--
2015-07-19T18:05:00NRManual testing261262--0.995--
2015-12-20T14:54:38Gordon SpenceManual testing262263--3.179--
2015-12-20T14:54:38Gordon SpenceManual testing263264--6.358--
2018-01-18T21:34:35Gordon SpenceManual testing264265--12.10--
2019-11-22T08:43:12Gordon SpenceManual testing265266--24.20--
2021-02-08T16:55:53YxinityManual testing266267--48.40--
2022-06-09T13:44:15Gordon SpenceManual testing267268--96.81--


ECM factoring results:

Old Calculation Method

Total ECM effort:24.562 GHz-days
Estimated T-Level:29.578
DigitsB1CurvesCompleteFacMiss
2011000873 / 1008.7300.015%
2550000873 / 2803.1184.401%
30250000586 / 6400.91639.998%

New Calculation Method

Total ECM effort:24.562 GHz-days
Estimated T-Level:29.578
DigitsB1CompleteFacMiss
201100064.3110.000%
25500009.2750.009%
302500000.97637.690%
3510000000.08092.293%
4030000000.00599.465%


ECM Summary

B1B2factorcurvesGHz-days
5000050000002872.191
2500002500000058622.37


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2001-12-08T00:00:00ANONYMOUSv4_computers1BEF992FFE5706F50.002


PRP results:
No PRP results for M308773


P-1 factor-bounds graph:
B1 = 100000000, B2 = 2000000000 (P-1 stage 2)
B1 = 100000000 (P-1 stage 1)
B1 = 10000000, B2 = 200000000 (P-1 stage 2)
B1 = 2000000, B2 = 200000000 (P-1 stage 2)
B1 = 10000000 (P-1 stage 1)
B1 = 2000000 (P-1 stage 1)
B1 = 131072, B2 = 13107200 (P-1 stage 2)
B1 = 65536, B2 = 6553600 (P-1 stage 2)
B1 = 308773 (P-1 stage 1)
B1 = 32768, B2 = 3276800 (P-1 stage 2)
B1 = 131072 (P-1 stage 1)
B1 = 50000, B2 = 1000000 (P-1 stage 2)
B1 = 11000, B2 = 1100000 (P-1 stage 2)
B1 = 65536 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 32768 (P-1 stage 1)
B1 = 11000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-06-09T13:44:15+00:00