is 2 72661583 - 1
has 21873317 decimal digits
takes 194.269 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
1 primality tests remaining
ResidueStatus
L-LFA27A861994688__
needs double-check
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual275105.308964.0000%620000119350004.79353.5840%110.102365.2902%1.2902%
PrimeNet2703.288561.4286%320000140000004.13005.5361%7.418563.5639%2.1354%
GPU7227452.653263.5135%500000170000005.42344.1222%58.076665.0176%1.5040%
Difference+1+52.6556+0.4865%+120000-5065000-0.6299-0.5382%+52.0257+0.2727%+0.2727%

Known prime factors:
No known factors for M72661583

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2015-08-23T14:30:00La GüiraLa_duodecima62000011935000---4.793--3.584%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2002-05-25T00:00:00Jocelyn Larouchev4_computers21257--0.000--
2008-09-19T11:27:00Wojciech FlorekManual testing21264--0.049--
2010-05-21T16:39:00GrunwalderGIMPcompute-0-5264265--0.051--
2010-05-23T08:48:00Geoff WingG265266--0.103--
2010-05-25T13:13:00Geoff WingG266267--0.206--
2010-05-25T21:24:00ANONYMOUSPhenom267268--0.411--
2010-05-29T09:22:00Radek Eronheniu268269--0.823--
2012-11-21T08:41:00Robert_SoCalManual testing269270--1.645--
2013-07-03T01:51:00SMoffatManual testing270271--3.291--
2015-03-12T01:20:001997rj7Manual testing271272--6.582--
2015-08-16T19:30:00Guido LorenziniManual testing272273--13.16--
2015-08-16T19:30:00Guido LorenziniManual testing273274--26.33--
2015-08-16T19:30:00Guido LorenziniManual testing274275--52.66--


ECM factoring results:
No ECM results for M72661583


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2015-12-21T12:10:23curtiscwd-210--16lFA27A861994688__194.3


PRP results:
No PRP results for M72661583


P-1 factor-bounds graph:
B1 = 620000, B2 = 11935000 (P-1 stage 2)
B1 = 620000 (P-1 stage 1)
104
105
106
104
105
106
107
108
TF factor-bounds graph:
275
274
273
272
271
270
269
268
267
266
265
264
257
250
260
270
280
290
2100
Last modified: 2015-12-21T12:10:23+00:00