is 2 2449877 - 1
has 737487 decimal digits
takes 0.166 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L1E5B7552CB3B9319double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26712.128767.1642%2000000600000000.50557.6313%12.634269.6700%2.5058%
PrimeNet2590.031362.7119%100001800000.00192.5282%0.033263.6546%0.9427%
GPU722630.651565.0794%100001600000.00181.3333%0.653265.5450%0.4656%
Difference+4+11.4773+2.0848%+1990000+59840000+0.5037+6.2980%+11.9809+4.1250%+4.1250%

Known prime factors (1 factor, 71.4 bits, 0.00291281% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
244987730310860777642555251272271.360618620052713719
7 × 2333 × 37880108549
2015-07-09233337880108549259.33202.16377.58

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-14T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.289%
2003-10-31T00:00:00Team Prime Ribv4_computers15000232500---0.003--0.921%
2010-12-15T23:00:00Jocelyn LaroucheManual testing2000020000---0.002--0.312%
2011-01-19T11:03:00Oscar Östlin950001947500---0.019--2.674%
2014-01-31T01:17:00mikrMSI117200048000000---0.365--7.028%
2018-09-28T16:27:04alpertronManual testing20000006000000012---0.505--7.631%
2019-02-05T11:16:48Jocelyn LaroucheManual testing10000001000000---0.098--2.739%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-15T00:00:00ANONYMOUSv4_computers21259--0.031--
2022-03-10T05:52:54LordJuliusManual testing21260--0.063--
2009-01-14T02:09:00Sturle Sundewright.ifi260261--0.063--
2012-06-07T00:43:00Sebastian HornbostelManual testing261262--0.125--
2013-12-04T21:13:00Jerry HallettManual testing262263--0.401--
2015-02-27T20:41:00VictordeHollanderManual testing263264--0.801--
2015-02-27T20:41:00VictordeHollanderManual testing264265--1.525--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.250 GHz-days
Estimated T-Level:0.700
DigitsB1CurvesCompleteFacMiss
201100014 / 1000.14086.875%
255000014 / 2800.05095.114%

New Calculation Method

Total ECM effort:1.250 GHz-days
Estimated T-Level:0.700
DigitsB1CompleteFacMiss
20110000.45263.660%
25500000.04196.001%
302500000.00399.749%


ECM Summary

B1B2factorcurvesGHz-days
500005000000121.071
50000500000020.179


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-26T00:00:00ANONYMOUSv4_computers1E5B7552CB3B93190.166


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-13T17:24:41Oliver KruseGTX-10BAD9CDC320395__no
2017-11-28T11:18:58kkmrkkblmbrbkc4.xlarge
3031086077764255525127
0BAD9CDC320395__no


P-1 factor-bounds graph:
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 1172000, B2 = 48000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 1172000 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
B1 = 95000, B2 = 1947500 (P-1 stage 2)
B1 = 95000 (P-1 stage 1)
B1 = 15000, B2 = 232500 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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102
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1010
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TF factor-bounds graph:
267
265
264
263
262
261
260
259
250
260
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290
2100
Last modified: 2022-03-10T05:52:54+00:00