is 2 20563759 - 1
has 6190309 decimal digits
takes 14.573 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LF721D40AA2DACF83double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual27393.020265.7534%23500048762500.50132.6748%93.521566.6694%0.9160%
PrimeNet2650.354861.5385%9000032000000.26665.0159%0.621463.4677%1.9292%
GPU722695.805763.7681%15000045000000.39773.7730%6.203465.1351%1.3670%
Difference+4+87.2145+1.9853%+85000+376250+0.1037-1.0982%+87.3181+1.5343%+1.5343%

Known prime factors:
No known factors for M20563759

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-21T00:00:00ANONYMOUSv4_computers310000310000---0.319--1.127%
2017-04-08T17:56:22James Heinrichi7-92023500048762506---0.501--2.675%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2000-01-12T00:00:00ANONYMOUSv4_computers231252--2.91757e-5--
2000-11-05T00:00:00Jocelyn Larouchev4_computers21254--0.000--
2001-01-14T00:00:00ANONYMOUSv4_computers21256--0.000--
2002-11-02T00:00:00Vaxmanv4_computers21266--0.718--
2015-03-02T12:30:00NRManual testing266267--0.727--
2017-04-15T20:18:25ramgeisManual testing267268--1.454--
2017-10-26T21:21:09VictordeHollanderManual testing268269--2.907--
2018-05-25T14:16:43ramgeisManual testing269270--5.814--
2021-09-13T16:08:48SRBaseManual testing270271--11.63--
2021-10-01T19:29:25-Anonymous-Manual testing271272--23.26--
2021-11-26T12:05:14-Anonymous-Manual testing272273--46.51--


ECM factoring results:
No ECM results for M20563759


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2005-02-02T00:00:00curtiscv4_computersF721D40AA2DACF8314.57
2005-02-18T00:00:00curtiscv4_computersF721D40AA2DACF8314.57
2005-02-23T00:00:00curtiscv4_computersF721D40AA2DACF8314.57
2008-10-31T17:49:00ANONYMOUSv4_computersF721D40AA2DACF8314.57
2008-11-18T00:00:00ANONYMOUSv4_computersF721D40AA2DACF8314.57


PRP results:
No PRP results for M20563759


P-1 factor-bounds graph:
B1 = 235000, B2 = 4876250 (P-1 stage 2)
B1 = 310000 (P-1 stage 1)
B1 = 235000 (P-1 stage 1)
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107
TF factor-bounds graph:
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Last modified: 2021-11-26T12:05:14+00:00