is 2 155291 - 1
has 46748 decimal digits
takes 0.001 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LDC4667A603EC5470double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual267191.343573.1343 %10000000020000000000.975512.1069 %192.318976.3869 %
Target2440.000059.0909 %28002750000.00017.4564 %0.000162.1413 %
Difference+23+191.3434+14.0434 %+99997200+1999725000+0.9754+4.6505%+192.3188+14.2457 %

Known prime factors (1 factor, 103.6 bits, 0.06672767% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1552911560806706508757064785900765313732103.62250254255124532557095578648
23 × 3 × 52121 × 1830487751 × 21947347087
2015-07-061830487751219473470878.267e+1114.02717.856

P-1 results:
dateusercompB1B2BSstagefactordigitsbits*GHz-daysFac Prob
2001-04-29ANONYMOUSv4_computers10000010000000--0.00323.965%
2002-06-02ANONYMOUSv4_computers32768327680012--0.00119.798%
2002-07-20ANONYMOUSv4_computers65536655360012--0.00222.399%
2003-02-09ANONYMOUSv4_computers1310721310720030--0.00424.959%
2003-10-08ANONYMOUSv4_computers2621442621440012--0.00827.472%
2009-01-11axnManual testing500000020000000012--0.07534.854%
2013-06-05alpertronManual testing100000000200000000012--0.97541.586%


Trial Factoring results:
5758596061626364656667
 BitsFactor
dateuseridcompidfromtofactorbits*digitsGHz-days
1999-10-29ANONYMOUSv4_computers2522530.004
2000-05-05ANONYMOUSv4_computers212540.015
2022-03-07LordJuliusManual testing254255
2001-01-08ANONYMOUSv4_computers212560.062
2002-07-06ANONYMOUSv4_computers212570.124
2022-03-07LordJuliusManual testing257258
2009-01-01Sturle Sundegoober.ifi2582590.247
2009-01-23Sturle Sundegilia.ifi2592600.495
2013-09-09lycornasteroid2602610.989


ECM factoring results:
Total ECM effort:13.676 GHz-days
Estimated T-Level:30.526
DigitsB1CompleteFacMiss
201100070.4410.000%
255000010.5460.003%
302500001.17630.861%
3510000000.10590.010%
4030000000.00899.211%


ECM Summary

B1B2factorcurvesGHz-days
10.139
5000050000002750.864
250000250000005879.96
1000000100000000392.713


Lucas-Lehmer results:
No L-L results for M155291


PRP results:
dateuseridcompidcofactorsres64
2017-09-21Oliver KruseOllaptop
15608067065087570647859007653137
77A69AE798F56CB6
2017-09-22Oliver KruseManual testing
15608067065087570647859007653137
77A69AE798F56CB6
2017-10-11kkmrkkblmbrbkc4.xlarge
15608067065087570647859007653137
77A69AE798F56CB6
2020-04-17Oliver KruseAddPrpType5
15608067065087570647859007653137
5D4702E5E935249F
2024-02-03Wentao HuangManual testing
15608067065087570647859007653137
5D4702E5E935249F


CERT results:
dateuseridcompid
2024-02-03slaurnocebo


P-1 factor-bounds graph:
B1 = 100000000, B2 = 2000000000 (P-1 stage 2)
B1 = 100000000 (P-1 stage 1)
B1 = 5000000, B2 = 200000000 (P-1 stage 2)
B1 = 5000000 (P-1 stage 1)
B1 = 262144, B2 = 26214400 (P-1 stage 2)
B1 = 131072, B2 = 13107200 (P-1 stage 2)
B1 = 100000, B2 = 10000000 (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 = 100000 (P-1 stage 1)
B1 = 65536 (P-1 stage 1)
B1 = 32768 (P-1 stage 1)
103
104
105
106
107
108
109
1010
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
261
260
259
258
257
256
255
254
253
this exponent TF target: 44
TF double-checked to: 67
ECM T-Level=30.53 ~= 85-bit
250
260
270
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290
2100
2110
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Last modified: 2024-02-09T03:30:02+00:00