is 2 101221 - 1
has 30471 decimal digits
takes 0.000 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LA99605011DB2B5D6double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual267293.554974.6269%100000000067366001102401,185.694225.4988%1,479.249181.0967%6.4698%
PrimeNet2400.000057.5000%1100190000.00008.0820%0.000060.9349%3.4349%
GPU722440.000061.3636%1200180000.00004.1585%0.000062.9703%1.6067%
Difference+23+293.5548+13.2632%+999998800+6736600092240+1,185.6942+21.3403%+1,479.2491+18.1264%+4.8631%

Known prime factors (1 factor, 120.1 bits, 0.11864193% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
101221141533204860356111180646489779839582337120.0916991296512598972109574420810891
37 × 389 × 547 × 888012481260120494483521
2019-04-295478880124812601204944835211.797e+121.559e+142.912e+14

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2000-11-25T00:00:00ANONYMOUSv4_computers100000025000000---0.007--4.292%
2002-06-02T00:00:00ANONYMOUSv4_computers327683276800---0.001--1.317%
2002-07-20T00:00:00ANONYMOUSv4_computers655366553600---0.001--1.926%
2003-02-02T00:00:00ANONYMOUSv4_computers13107213107200---0.003--2.664%
2003-09-21T00:00:00ANONYMOUSv4_computers26214426214400---0.005--3.519%
2012-11-21T13:01:00alpertronManual testing1000000002000000000---0.656--11.734%
2016-11-25T14:04:20mikrS0523500000002550000000012---5.543--16.223%
2021-12-18T16:44:32Seth_TrManual testing10000000006736600110240---1,186--25.499%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-09-14T00:00:00ANONYMOUSv4_computers252253--0.006--
1999-12-30T00:00:00ANONYMOUSv4_computers253254--0.012--
2022-03-07T02:02:53LordJuliusManual testing254255--0.024--
2000-12-07T00:00:00ANONYMOUSv4_computers21256--0.095--
2000-12-14T00:00:00ANONYMOUSv4_computers21256--0.095--
2002-04-20T00:00:00ANONYMOUSv4_computers21257--0.190--
2016-02-23T16:27:54Mark RoseManual testing257258--0.190--
2009-01-05T21:23:00Sturle Sundeginglo.ifi258259--0.379--
2009-02-03T02:10:00monstkingslake259260--0.759--
2012-03-05T10:15:00Richard B. WoodsPuttputt260261--1.517--
2015-07-16T18:26:00NRManual testing261262--3.035--
2016-02-04T12:24:17monstedManual testing262263--9.70--
2016-02-17T13:50:42Gordon SpenceManual testing263264--19.40--
2018-02-18T01:45:28BloodERazorManual testing264265--36.91--
2019-04-27T17:32:48BloodERazorManual testing265266--73.83--


ECM factoring results:
Total ECM effort:115.221 GHz-days
Estimated T-Level:35.808
DigitsB1CompleteFacMiss
2011000396.6060.000%
255000078.0240.000%
3025000012.0420.001%
3510000001.52521.765%
4030000000.16285.086%
45110000000.01598.540%
50440000000.00199.882%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
5000050000002930.680
250000250000005796.721
10000001000000001,77982.61
300000030000000018125.21


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2016-06-01T06:37:16MadPooManual testingA99605011DB2B5D60.000


PRP results:
dateuseridcompidcofactorsres64PRP
2019-04-30T17:09:31matzetonibobuba
1415332048603561111806464897798395823
A95D2AF63EEA6001no
2019-05-02T19:54:44bunddogdebian
1415332048603561111806464897798395823
77EDC87B4ED6F79Dno
2019-05-03T17:08:08kkmrkkblmbrbkc5.large
1415332048603561111806464897798395823
A95D2AF63EEA6001no
2019-07-16T15:55:15kkmrkkblmbrbkc5.large
1415332048603561111806464897798395823
77EDC87B4ED6F79Dno
2022-04-15T06:47:25LordJuliusWhiteBox
1415332048603561111806464897798395823
A95D2AF63EEA6001no


P-1 factor-bounds graph:
B1 = 1000000000, B2 = 6736600110240 (P-1 stage 2)
B1 = 350000000, B2 = 25500000000 (P-1 stage 2)
B1 = 1000000000 (P-1 stage 1)
B1 = 350000000 (P-1 stage 1)
B1 = 100000000, B2 = 2000000000 (P-1 stage 2)
B1 = 100000000 (P-1 stage 1)
B1 = 1000000, B2 = 25000000 (P-1 stage 2)
B1 = 262144, B2 = 26214400 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 131072, B2 = 13107200 (P-1 stage 2)
B1 = 65536, B2 = 6553600 (P-1 stage 2)
B1 = 262144 (P-1 stage 1)
B1 = 32768, B2 = 3276800 (P-1 stage 2)
B1 = 131072 (P-1 stage 1)
B1 = 65536 (P-1 stage 1)
B1 = 32768 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-04-15T06:47:25+00:00