is 2 1581053 - 1
has 475945 decimal digits
takes 0.071 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LB1155D7850F7B3F8double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26718.793868.6567%100000002000000001.31819.7407%20.111971.7098%3.0531%
PrimeNet2570.012163.1579%70001200000.00092.5422%0.013064.0945%0.9366%
GPU722610.194365.5738%6500600000.00061.0535%0.194965.9365%0.3627%
Difference+6+18.5995+3.0829%+9993500+199940000+1.3175+8.6871%+19.9170+5.7733%+5.7733%

Known prime factors (1 factor, 77.8 bits, 0.00492290% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
15810532693156302722267533229672477.83485169703442018311
35 × 59 × 709 × 8378776667
2015-09-09709837877666731,13829.56655.221

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-29T00:00:00Team Prime Ribv4_computers20000300000---0.002--1.008%
2011-02-02T00:43:00James HeinrichWHS850001402500---0.010--2.258%
2013-12-15T05:11:00David Campeaui5-2500k97000028130000---0.159--6.005%
2015-04-05T09:11:00VictordeHollanderManual testing10000000200000000---1.318--9.741%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-08-08T00:00:00ANONYMOUSv4_computers21258--0.024--
2010-05-04T17:20:00Architects Cubeda3_bu2260261--0.097--
2010-06-14T19:20:00GrunwalderGIMPManual testing21263--1.009--
2015-03-02T00:57:00snme2pm1Manual testing263264--1.242--
2015-03-02T00:57:00snme2pm1Manual testing264265--2.363--


ECM factoring results:

Old Calculation Method

Total ECM effort:14.056 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:14.056 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024813.89
50000500000030.168


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-28T00:00:00ANONYMOUSv4_computersB1155D7850F7B3F80.071
2015-07-03T04:32:00MadPooManual testingB1155D7850F7B3F80.071


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-02T00:12:30Oliver KruseGTX-1
269315630272226753322967
3F71E4A2A694A0__no
2017-10-31T13:10:44kkmrkkblmbrbkc4.xlarge
269315630272226753322967
3F71E4A2A694A0__no


P-1 factor-bounds graph:
B1 = 10000000, B2 = 200000000 (P-1 stage 2)
B1 = 10000000 (P-1 stage 1)
B1 = 970000, B2 = 28130000 (P-1 stage 2)
B1 = 970000 (P-1 stage 1)
B1 = 85000, B2 = 1402500 (P-1 stage 2)
B1 = 85000 (P-1 stage 1)
B1 = 20000, B2 = 300000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
101
102
103
104
105
106
107
101
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
267
265
264
263
261
258
250
260
270
280
290
2100
Last modified: 2019-08-19T13:20:21+00:00