is 2 1597763 - 1
has 480975 decimal digits
takes 0.071 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-LFC87F11AFF899EE7double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual26718.597268.6567%500000150000000.08354.9863%18.680770.2196%
Target2610.192365.5738%6500600000.00061.0560%0.192965.9373%
Difference+6+18.4049+3.0829%+493500+14940000+0.0829+3.9303%+18.4879+4.2823%

Known prime factors (2 factors, 134.6 bits, 0.00842203% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1597763837790895872321774072066.18326217621007381
149 × 30839 × 5705671
2013-11-2930839570567117.2630.02200.0376
15977633843130231973061746172168.381120265966603716
22 × 3 × 17 × 589539051979
2019-09-021758953905197973.5552,080.33,885.4

1 Composite Factors:
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-02-05James HeinrichWHS850001445000---0.010--2.279%
2013-11-29David Campeaui5-2500k500000150000002066.1830.0840.1430.1674.986%
2016-03-16alpertronManual testing5000001500000012-
skipped known factor: 83779089587232177407
--0.084--4.986%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-07-27ANONYMOUSv4_computers21257--0.012--
2003-07-30ANONYMOUSv4_computers21258--0.024--
2010-05-10Architects Cubedm1_f2260261--0.096--
2010-07-04GrunwalderGIMPManual testing21263--0.999--


ECM factoring results:
Total ECM effort:31.357 GHz-days
Estimated T-Level:25.718
DigitsB1CompleteFacMiss
201100014.6540.000%
25500001.67418.740%
302500000.14486.623%
3510000000.01099.005%


ECM Summary

B1B2factorcurvesGHz-days
5000050000001679.362
500005000000844.709
250000400000005017.29


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1997-01-01Kurt SteinkrausFC87F11AFF899EE70.071


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-02Oliver KruseGTX-3
83779089587232177407
B74B6C2A4C77F5__no
2017-10-31kkmrkkblmbrbkc4.xlarge
83779089587232177407
B74B6C2A4C77F5__no
2019-09-03mnd975202b
83779089587232177407
384313023197306174617
1F703B914293193Dno
2019-09-03ATHec2-PRPCFDC
83779089587232177407
384313023197306174617
1F703B914293193Dno


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 85000, B2 = 1445000 (P-1 stage 2)
B1 = 85000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
1010
1011
1012
TF factor-bounds graph:
263
261
258
257
this exponent TF target: 61
TF double-checked to: 67.8
ECM T-Level=25.72 ~= 69-bit
250
260
270
Last modified: 2023-04-26T21:34:10+00:00