is 2 2347271 - 1
has 706599 decimal digits
takes 0.159 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LD15DAA7208EF2E5Adouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26712.658967.1642%500000150000000.12645.2225%12.785368.8790%1.7148%
PrimeNet2580.016462.0690%110002000000.00213.0480%0.018463.2251%1.1561%
GPU722620.261764.5161%130002200000.00241.8351%0.264165.1673%0.6512%
Difference+5+12.3972+2.6481%+487000+14780000+0.1240+3.3874%+12.5212+3.7117%+3.7117%

Known prime factors (1 factor, 86.8 bits, 0.00369678% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
23472711322486073320458889367198232786.77328170715552666455841
7309 × 3854250315045349
2017-02-24730938542503150453498,672,17820,569,70638,418,482

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-21T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.286%
2010-03-03T08:37:00Budannan50000010000000---0.100--4.832%
2018-03-18T01:20:11alpertronManual testing5000001500000012---0.126--5.222%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-29T00:00:00ANONYMOUSv4_computers21258--0.016--
2016-02-23T16:29:12Mark RoseManual testing258260--0.049--
2009-01-15T06:42:00Sturle Sundecelair.ifi260261--0.065--
2012-05-29T10:43:00Sebastian HornbostelManual testing261262--0.131--
2013-01-23T08:26:00dbaughManual testing262263--0.418--
2015-03-06T11:15:00VictordeHollanderManual testing263264--0.836--
2015-03-06T11:15:00VictordeHollanderManual testing264265--1.592--
2015-10-26T11:50:57ramgeisManual testing265266--3.184--


ECM factoring results:

Old Calculation Method

Total ECM effort:2.307 GHz-days
Estimated T-Level:1.300
DigitsB1CurvesCompleteFacMiss
201100026 / 1000.26077.004%
255000026 / 2800.09391.117%

New Calculation Method

Total ECM effort:2.307 GHz-days
Estimated T-Level:1.300
DigitsB1CompleteFacMiss
20110000.83943.227%
25500000.07692.700%
302500000.00599.534%


ECM Summary

B1B2factorcurvesGHz-days
500005000000242.130
50000500000020.177


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-26T00:00:00ANONYMOUSv4_computersD15DAA7208EF2E5A0.159


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-12T05:29:53Oliver KruseGTX-0
132248607332045888936719823
43C735F32FE1D8__no
2017-11-24T10:04:10kkmrkkblmbrbkc4.xlarge
132248607332045888936719823
43C735F32FE1D8__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000, B2 = 10000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2018-03-18T01:20:11+00:00