is 2 1843981 - 1
has 555094 decimal digits
takes 0.100 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LDDECE9C13173C127double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.114068.6567%10000001019227209043.755912.7491%59.869972.6527%3.9960%
PrimeNet2570.010463.1579%80001500000.00122.8832%0.011664.2201%1.0622%
GPU722610.166665.5738%90001500000.00131.6299%0.167966.1349%0.5611%
Difference+6+15.9474+3.0829%+991000+10192122090+43.7546+11.1192%+59.7020+6.5178%+6.5178%

Known prime factors (1 factor, 63.2 bits, 0.00342856% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1843981107574395411220438312063.2222916906286215
3 × 5 × 192 × 89 × 6052489
2011-05-0736160524890.88280.02600.0484

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2022-04-03T12:48:48Jocelyn LaroucheManual testing10000001035044010-
skipped known factor: 10757439541122043831
--4.510--10.143%
2022-04-03T12:48:49Jocelyn LaroucheManual testing100000010192272090-
skipped known factor: 10757439541122043831
--43.76--12.749%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2010-04-08T13:19:00Architects CubedManual testing260261--0.083--
2011-01-21T16:11:00GrunwalderGIMPManual testing21263--0.866--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.236 GHz-days
Estimated T-Level:24.464
DigitsB1CurvesCompleteFacMiss
2011000250 / 1002.5008.106%
2550000250 / 2800.89340.883%

New Calculation Method

Total ECM effort:19.236 GHz-days
Estimated T-Level:24.464
DigitsB1CompleteFacMiss
201100010.3240.003%
25500000.95038.672%
302500000.06094.148%
3510000000.00399.717%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
500005000000292.005
50000660000021416.68
50000675000070.551


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-21T00:00:00foxkidv4_computersDDECE9C13173C1270.100


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T04:42:07Oliver KruseGTX-1
10757439541122043831
A8B22B4B838131__no
2017-11-06T20:51:38kkmrkkblmbrbkold
10757439541122043831
A8B22B4B838131__no


P-1 factor-bounds graph:
B1 = 1000000, B2 = 10192272090 (P-1 stage 2)
B1 = 1000000, B2 = 1035044010 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
267
263
261
250
260
270
280
290
2100
Last modified: 2022-04-03T12:48:49+00:00