is 2 2554099 - 1
has 768861 decimal digits
takes 0.177 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LC3C4CE3B5F26A575double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26711.633867.1642%32000001120000000.91808.7452%12.551870.0357%2.8716%
PrimeNet2590.030162.7119%110002000000.00212.6861%0.032263.7134%1.0016%
GPU722630.624965.0794%120001800000.00211.4785%0.627065.5957%0.5163%
Difference+4+11.0089+2.0848%+3188000+111820000+0.9159+7.2667%+11.9248+4.4401%+4.4401%

Known prime factors (1 factor, 85.1 bits, 0.00333364% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2554099427634511741821980040281512685.1458371533596423278425
3 × 52 × 419 × 1637 × 162735033893
2017-10-0116371627350338934,850,877891.711,665.5

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-10-23T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.293%
2003-11-08T00:00:00Team Prime Ribv4_computers15000198750---0.003--0.885%
2010-12-19T21:44:00Jocelyn LaroucheManual testing2000020000---0.002--0.315%
2011-01-03T14:35:00Jocelyn LaroucheManual testing3000030000---0.003--0.433%
2011-01-09T14:30:00Jocelyn LaroucheManual testing5000050000---0.005--0.620%
2011-04-09T12:38:00James HeinrichWHS1750004068750---0.039--3.529%
2016-03-29T11:39:24mikrMSI320000011200000012---0.918--8.745%
2019-07-04T12:40:36alpertronManual testing20000006000000012---0.519--7.664%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-03-15T00:00:00ANONYMOUSv4_computers21259--0.030--
2016-02-23T16:29:16Mark RoseManual testing259260--0.030--
2009-01-30T15:39:00Sturle Sundegorky.ifi260261--0.060--
2012-06-16T17:43:00Sebastian HornbostelManual testing261262--0.120--
2013-01-14T11:53:00dbaughManual testing262263--0.384--
2015-02-23T17:24:00VictordeHollanderManual testing263264--0.769--
2015-02-23T17:24:00VictordeHollanderManual testing264265--1.463--
2015-11-04T00:17:01omylistManual testing265266--2.926--
2017-08-10T07:53:54Gordon SpenceManual testing266267--5.852--


ECM factoring results:

Old Calculation Method

Total ECM effort:2.306 GHz-days
Estimated T-Level:1.250
DigitsB1CurvesCompleteFacMiss
201100025 / 1000.25077.782%
255000025 / 2800.08991.444%

New Calculation Method

Total ECM effort:2.306 GHz-days
Estimated T-Level:1.250
DigitsB1CompleteFacMiss
20110000.80644.644%
25500000.07392.971%
302500000.00499.552%


ECM Summary

B1B2factorcurvesGHz-days
500005000000242.213
50000500000010.092


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-26T00:00:00ANONYMOUSv4_computersC3C4CE3B5F26A5750.177


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-14T22:27:30Oliver KruseGTX-2FDE83C7AFDF37B__no
2017-10-15T17:17:20YarBerManual testing
42763451174182198004028151
no
2017-12-01T14:20:13kkmrkkblmbrbkc4.xlarge
42763451174182198004028151
FDE83C7AFDF37B__no
2017-12-05T11:08:06kkmrkkblmbrbkc4.xlarge
42763451174182198004028151
DE0AC33F953FFF__no


P-1 factor-bounds graph:
B1 = 3200000, B2 = 112000000 (P-1 stage 2)
B1 = 2000000, B2 = 60000000 (P-1 stage 2)
B1 = 3200000 (P-1 stage 1)
B1 = 2000000 (P-1 stage 1)
B1 = 175000, B2 = 4068750 (P-1 stage 2)
B1 = 175000 (P-1 stage 1)
B1 = 50000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
B1 = 15000, B2 = 198750 (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)
102
103
104
105
106
107
102
103
104
105
106
107
108
109
1010
1011
1012
TF factor-bounds graph:
267
266
265
264
263
262
261
260
259
250
260
270
280
290
2100
Last modified: 2019-07-04T12:40:36+00:00