is 2 51890519 - 1
has 15620603 decimal digits
takes 99.409 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
factored, 0 LL tests remaining
ResidueStatus
L-L7BC502EAFAFC99C8double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27218.429863.8889%50000090000002.67534.2428%21.105265.4210%
Target27336.863164.3836%3400008800000014.21123.8042%51.074365.7385%
Difference-1-18.4332-0.4947%+160000-79000000-11.5359+0.4386%-29.9691-0.3175%

Known prime factors (1 factor, 68.5 bits, 0.00013204% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
518905194228353478050025996312168.5194074302550385
5 × 17 × 47932971181
2015-01-2117479329711812.20227,254.313,549

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2012-01-01Sid & AndyEmperor_Zurg5000009000000---2.675--4.243%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2000-02-23ANONYMOUSv4_computers21254--4.62483e-5--
2000-04-27ANONYMOUSv4_computers21256--0.000--
2001-06-03ANONYMOUSv4_computers21257--0.000--
2002-03-24ANONYMOUSv4_computers21258--0.001--
2003-11-28ANONYMOUSv4_computers21260--0.003--
2022-04-05LordJuliusManual testing260263--0.028--
2009-01-31JJMBmc263264--0.038--
2009-02-02ctenzerGeant4264265--0.072--
2009-02-03ctenzerGeant4265266--0.144--
2009-02-05ctenzerGeant4266267--0.288--
2009-04-19PiepenC7F7F6027267268--0.576--
2010-03-20sannerud.comJimEmcLap268269--1.152--
2015-01-21Mark RoseManual testing268269*68.519211.054235.92.501
2011-11-09Ethan O'ConnorManual testing269270--2.304--
2011-11-27XyzzyManual testing270271--4.608--
2011-11-28XyzzyManual testing271272--9.217--


ECM factoring results:
No ECM results for M51890519


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2012-02-17curtiscjckl-cck08l7BC502EAFAFC99C899.41


PRP results:
No PRP results for M51890519


P-1 factor-bounds graph:
B1 = 500000, B2 = 9000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
272
271
270
269
268
267
266
265
264
263
260
258
257
256
254
this exponent TF target: 73
TF double-checked to: 67.8
250
260
270
280
Last modified: 2023-06-05T21:50:05+00:00