is 2 2563633 - 1
has 771731 decimal digits
takes 0.178 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LACB805814CD95693double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26711.590667.1642%32000001120000000.91808.7483%12.508670.0368%2.8726%
PrimeNet2590.030062.7119%110002000000.00212.6879%0.032163.7141%1.0023%
GPU722630.622665.0794%120001800000.00211.4796%0.624765.5960%0.5167%
Difference+4+10.9680+2.0848%+3188000+111820000+0.9159+7.2687%+11.8839+4.4407%+4.4407%

Known prime factors (1 factor, 103.1 bits, 0.00402074% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
25636331069734036880039830451323031627332103.0772086363447654246591558392
23 × 32 × 7 × 19 × 349 × 239243 × 337013 × 7742737
2016-05-1133701377427375.827e+100.07450.0792

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%
2010-12-21T01:09:00Jocelyn LaroucheManual testing2000020000---0.002--0.316%
2011-01-03T22:20:00Jocelyn LaroucheManual testing3000030000---0.003--0.433%
2011-01-10T23:57:00Jocelyn LaroucheManual testing5000050000---0.005--0.620%
2011-04-14T00:36:00James HeinrichWHS1750004112500---0.039--3.539%
2016-05-11T06:14:22mikrMSI32000001120000001232103.0770.9180.3561.8368.748%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-02-08T00:00:00ANONYMOUSv4_computers21258--0.015--
1999-03-15T00:00:00JG12v4_computers21259--0.030--
2016-02-23T16:29:16Mark RoseManual testing259260--0.030--
2009-01-31T20:58:00Sturle Sundegowin.ifi260261--0.060--
2012-06-17T10:43:00Sebastian HornbostelManual testing261262--0.120--
2013-01-23T08:30:00dbaughManual testing262263--0.383--
2015-02-23T17:24:00VictordeHollanderManual testing263264--0.766--
2015-02-23T17:24:00VictordeHollanderManual testing264265--1.457--
2015-11-08T21:03:01ramgeisManual testing265266--2.915--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.661 GHz-days
Estimated T-Level:0.900
DigitsB1CurvesCompleteFacMiss
201100018 / 1000.18083.451%
255000018 / 2800.06493.763%

New Calculation Method

Total ECM effort:1.661 GHz-days
Estimated T-Level:0.900
DigitsB1CompleteFacMiss
20110000.58155.954%
25500000.05294.888%
302500000.00399.677%


ECM Summary

B1B2factorcurvesGHz-days
500005000000181.661


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-02-08T00:00:00ANONYMOUSv4_computersACB805814CD956930.178
1998-03-17T00:00:00ANONYMOUSv4_computersACB805814CD956930.178
1999-04-13T00:00:00JG12v4_computersACB805814CD956930.178


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-15T02:01:08Oliver KruseGTX-0
10697340368800398304513230316273
E8F79612DBF1F4__no
2017-12-01T16:23:11storm5510HP-Z220-CMT
10697340368800398304513230316273
E8F79612DBF1F4__no


P-1 factor-bounds graph:
B1 = 3200000, B2 = 112000000 (P-1 stage 2)
B1 = 3200000 (P-1 stage 1)
B1 = 175000, B2 = 4112500 (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
TF factor-bounds graph:
267
266
265
264
263
262
261
260
259
258
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260
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2100
2110
Last modified: 2017-12-01T16:23:11+00:00