is 2 4222051 - 1
has 1270964 decimal digits
takes 0.527 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L9CE845DDA932A503double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual272226.509368.0556 %1370000094554229770933.990714.9030 %1,160.500072.8163 %
Target2651.728064.6154 %2200022500000.02591.8766 %1.753965.2794 %
Difference+7+224.7813+3.4402 %+13678000+94551979770+933.9648+13.0265%+1,158.7460+7.5368 %

Known prime factors (1 factor, 76.6 bits, 0.00181530% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
42220511179789045683977988670892476.64313971752658648344
23 × 7 × 41 × 733 × 8301852833
2022-04-1573383018528334,789.181.799152.78

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2002-01-22ANONYMOUSv4_computers30000400000--0.0091.967%
2002-11-24ANONYMOUSv4_computers30000400000--0.0091.967%
2013-07-21Squeeky_SquirrelT7500_220013000025675006--0.0484.073%
2021-05-05Kingfactor16000006000000012--0.8659.346%
2022-04-15DRobinsonPEManual testing137000009455422977022476.6431,03822.122%


Trial Factoring results:
57585960616263646566676869707172
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
2002-01-08David Campeauv4_computers212610.036
2011-01-26markroldgamer2612620.073
2012-01-31GrunwalderGIMPManual testing212630.378
2016-02-23Mark RoseManual testing2622630.233
2013-11-18JayderManual testing2632640.465
2013-12-03David CampeauManual testing2642650.885
2015-06-08snme2pm1Manual testing2652661.770
2017-12-27YxinityManual testing2662673.540
2018-11-12chuenkitManual testing2672687.080
2021-01-23ANONYMOUSManual testing26827199.12
2021-01-24ANONYMOUSManual testing271272113.3


ECM factoring results:
Total ECM effort:1.994 GHz-days
Estimated T-Level:2.308
DigitsB1CompleteFacMiss
20110000.46263.031%
25500000.04395.819%
302500000.00399.731%


ECM Summary

B1B2factorcurvesGHz-days
500005000000121.994


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2000-02-09ANONYMOUSv4_computersCC778684988B5B290.527
2001-04-21ANONYMOUSv4_computers9CE845DDA932A5030.527


PRP results:
dateuseridcompidcofactorsres64
2022-04-21XZT800G3Mini3
117978904568397798867089
34B1F31D71A6BF31


CERT results:
dateuseridcompid
2022-04-21curtiscjckl3w14033l


P-1 factor-bounds graph:
B1 = 13700000, B2 = 94554229770 (P-1 stage 2)
B1 = 13700000 (P-1 stage 1)
B1 = 1600000, B2 = 60000000 (P-1 stage 2)
B1 = 1600000 (P-1 stage 1)
B1 = 130000, B2 = 2567500 (P-1 stage 2)
B1 = 130000 (P-1 stage 1)
B1 = 30000, B2 = 400000 (P-1 stage 2)
B1 = 30000 (P-1 stage 1)
101
102
103
104
105
106
107
108
101
102
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
272
271
268
267
266
265
264
263
262
261
this exponent TF target: 65
TF double-checked to: 67
ECM T-Level=2.31 ~= -9-bit
250
260
270
280
JSON version of this page
Last modified: 2024-03-13T02:15:48+00:00