is 2 3050561 - 1
has 918311 decimal digits
takes 0.260 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LD9BC9D6F5D4C6356double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26819.539067.6471%30000001000000001.02248.0351%20.561470.2467%2.5996%
PrimeNet2600.050363.3333%120002200000.00292.5229%0.053264.2584%0.9251%
GPU722641.166865.6250%140002200000.00311.4650%1.169966.1286%0.5036%
Difference+4+18.3722+2.0221%+2986000+99780000+1.0193+6.5701%+19.3915+4.1181%+4.1181%

Known prime factors (1 factor, 72.4 bits, 0.00237452% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
305056163893955175248670722712272.4361047249262926535
5 × 223 × 939237007109
2020-10-14223939237007109557.486,315.211,795

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2004-02-07T00:00:00ANONYMOUSv4_computers2048204800---0.002--0.249%
2010-10-04T14:45:00markrtiny1100002447500---0.029--2.665%
2016-03-15T22:19:01Squeeky_SquirrelP4_2600205000568875012---0.062--3.572%
2017-09-26T04:11:40mikrMSI300000010000000012---1.022--8.035%
2021-01-14T13:16:35Jocelyn LaroucheManual testing305056305056---0.038--1.534%
2021-01-17T03:41:52Jocelyn LaroucheManual testing30505630505616---0.056--3.287%
2022-01-23T08:35:01Jocelyn LaroucheManual testing1055056119912100---0.929--7.512%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-06-03T00:00:00ANONYMOUSv4_computers21260--0.050--
2009-02-12T21:13:00Sturle Sundegouffy.ifi260261--0.050--
2011-03-18T10:37:00Sid & AndyBuzz261262--0.101--
2013-01-07T13:54:00dbaughManual testing262263--0.322--
2015-02-07T18:28:00VictordeHollanderManual testing263264--0.644--
2015-02-07T18:28:00VictordeHollanderManual testing264265--1.225--
2015-06-06T19:31:00ThaManual testing265266--2.450--
2017-05-07T02:13:05Gordon SpenceManual testing266267--4.899--
2018-07-25T22:30:18ramgeisManual testing267268--9.80--


ECM factoring results:

Old Calculation Method

Total ECM effort:1.864 GHz-days
Estimated T-Level:0.800
DigitsB1CurvesCompleteFacMiss
201100016 / 1000.16085.146%
255000016 / 2800.05794.436%

New Calculation Method

Total ECM effort:1.864 GHz-days
Estimated T-Level:0.800
DigitsB1CompleteFacMiss
20110000.51659.683%
25500000.04795.442%
302500000.00399.713%


ECM Summary

B1B2factorcurvesGHz-days
500005000000151.747
50000500000010.116


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-08-22T00:00:00ANONYMOUSv4_computersD9BC9D6F5D4C63560.260


PRP results:
dateuseridcompidcofactorsres64PRP
2020-10-17T09:41:03Sébastien BrouckePortable_Seb
6389395517524867072271
E17541AA327EE1__no
2020-10-20T23:04:51arnaudstm-11-010
6389395517524867072271
E17541AA327EE1B3no


P-1 factor-bounds graph:
B1 = 3000000, B2 = 100000000 (P-1 stage 2)
B1 = 1055056, B2 = 119912100 (P-1 stage 2)
B1 = 3000000 (P-1 stage 1)
B1 = 1055056 (P-1 stage 1)
B1 = 205000, B2 = 5688750 (P-1 stage 2)
B1 = 305056, B2 = 3050561 (P-1 stage 2)
B1 = 305056 (P-1 stage 1)
B1 = 110000, B2 = 2447500 (P-1 stage 2)
B1 = 205000 (P-1 stage 1)
B1 = 110000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-01-23T08:35:01+00:00