is 2 20996009 - 1
has 6320429 decimal digits
takes 14.879 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L2617A5A2268F5C82double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27391.105165.7534%25500049725000.52612.7309%91.631366.6887%0.9353%
PrimeNet2650.347561.5385%10000032000000.27635.1082%0.623863.5032%1.9647%
GPU722695.686263.7681%15000045000000.39773.7838%6.083865.1391%1.3709%
Difference+4+85.4190+1.9853%+105000+472500+0.1285-1.0528%+85.5474+1.5496%+1.5496%

Known prime factors:
No known factors for M20996009

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-11-16T00:00:00ANONYMOUSv4_computers2550004972500---0.526--2.731%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2002-05-18T00:00:00Jocelyn Larouchev4_computers21257--0.001--
2002-11-09T00:00:00ANONYMOUSv4_computers21266--0.703--
2011-10-31T15:50:00Roman MaznichenkoManual testing266267--0.712--
2011-10-31T15:50:00Roman MaznichenkoManual testing267268--1.424--
2011-10-31T15:50:00Roman MaznichenkoManual testing268269--2.847--
2011-10-31T15:50:00Roman MaznichenkoManual testing269270--5.695--
2021-07-26T08:45:12Sid & AndyManual testing270271--11.39--
2021-09-23T11:21:44-Anonymous-Manual testing271272--22.78--
2021-11-06T15:47:53-Anonymous-Manual testing272273--45.56--


ECM factoring results:
No ECM results for M20996009


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2004-10-03T00:00:00lycornv4_computers2617A5A2268F5C8214.88
2008-07-12T00:00:00CaptainEntropyv4_computers2617A5A2268F5C8214.88


PRP results:
No PRP results for M20996009


P-1 factor-bounds graph:
B1 = 255000, B2 = 4972500 (P-1 stage 2)
B1 = 255000 (P-1 stage 1)
104
105
106
104
105
106
107
TF factor-bounds graph:
273
272
271
270
269
268
267
266
257
250
260
270
280
290
2100
Last modified: 2021-11-06T15:47:53+00:00