is 2 1473301 - 1
has 443508 decimal digits
takes 0.056 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L850D9F439C861155double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26720.168368.6567%2000000600000000.28577.2410%20.453970.9263%2.2696%
PrimeNet2560.006562.5000%70001200000.00072.9130%0.007263.5924%1.0924%
GPU722600.104265.0000%65001000000.00061.4478%0.104965.5067%0.5067%
Difference+7+20.0640+3.6567%+1993500+59900000+0.2850+5.7932%+20.3490+5.4195%+5.4195%

Known prime factors (1 factor, 82.1 bits, 0.00557267% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
147330151909109292929511547098172582.1021761660016959518508
22 × 3 × 7 × 20972143059041887
2016-02-037209721430590418871,172,48563,257,518118,147,427

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-29T00:00:00Team Prime Ribv4_computers20000270000---0.002--0.962%
2010-10-22T12:52:00Rob_Deetwopc100000200000---0.006--1.219%
2010-10-23T12:42:00Rob_Deetwopc200000300000---0.011--1.523%
2010-10-24T12:50:00Rob_Deetwopc2000001000000---0.013--2.338%
2010-10-25T12:25:00Rob_Deetwopc2000002000000---0.017--2.826%
2010-10-26T10:50:00Rob_Deetwopc2000003000000---0.020--3.118%
2010-10-27T12:43:00Rob_Deetwopc2000004000000---0.023--3.328%
2010-10-28T11:45:00Rob_Deetwopc2000005000000---0.026--3.492%
2014-11-19T23:20:00Jocelyn LaroucheManual testing243565243565---0.013--1.388%
2015-01-26T12:23:00Jocelyn LaroucheManual testing294713294713---0.016--1.522%
2015-01-28T21:36:00Jocelyn LaroucheManual testing324184324184---0.018--1.591%
2015-01-31T14:55:00Jocelyn LaroucheManual testing356602356602---0.020--1.663%
2015-02-15T21:12:00Jocelyn LaroucheManual testing392262392262---0.022--1.736%
2015-02-20T16:56:00Jocelyn LaroucheManual testing431488431488---0.024--1.811%
2015-02-26T11:47:00alpertronManual testing200000060000000---0.286--7.241%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-05-20T00:00:00Jocelyn Larouchev4_computers21257--0.013--
2003-07-30T00:00:00ANONYMOUSv4_computers21258--0.026--
2016-02-23T16:28:34Mark RoseManual testing258260--0.078--
2010-05-08T19:20:00Architects Cubedm1_tt260261--0.104--
2016-02-23T16:28:34Mark RoseManual testing261262--0.208--
2011-04-05T20:59:00GrunwalderGIMPManual testing21263--1.083--
2016-02-23T16:28:34Mark RoseManual testing262263--0.666--
2015-04-03T01:54:00snme2pm1Manual testing263264--1.333--
2015-04-03T01:54:00snme2pm1Manual testing264265--2.536--
2015-09-21T11:27:00ramgeisManual testing265266--5.072--


ECM factoring results:

Old Calculation Method

Total ECM effort:11.916 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:11.916 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024911.82
50000500000020.095


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-28T00:00:00ANONYMOUSv4_computers850D9F439C8611550.056
2015-07-01T17:35:00MadPooManual testing850D9F439C8611550.056


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-01T05:04:19Oliver KruseGTX-2
5190910929292951154709817
41033623493A0F__no
2017-10-28T06:36:55kkmrkkblmbrbkc4.xlarge
5190910929292951154709817
41033623493A0F__no


P-1 factor-bounds graph:
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 200000, B2 = 5000000 (P-1 stage 2)
B1 = 431488 (P-1 stage 1)
B1 = 200000, B2 = 4000000 (P-1 stage 2)
B1 = 392262 (P-1 stage 1)
B1 = 356602 (P-1 stage 1)
B1 = 200000, B2 = 3000000 (P-1 stage 2)
B1 = 324184 (P-1 stage 1)
B1 = 200000, B2 = 2000000 (P-1 stage 2)
B1 = 294713 (P-1 stage 1)
B1 = 200000, B2 = 1000000 (P-1 stage 2)
B1 = 243565 (P-1 stage 1)
B1 = 200000, B2 = 300000 (P-1 stage 2)
B1 = 200000 (P-1 stage 1)
B1 = 100000, B2 = 200000 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 20000, B2 = 270000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2019-04-19T08:39:09+00:00