is 2 3072947 - 1
has 925050 decimal digits
takes 0.262 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L4A3953FAB099EA17double-checked
PRP63DD998CBB82E722verified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26819.396667.6471%30000001000000001.02248.0409%20.419170.2485%2.6015%
PrimeNet2600.050063.3333%120002200000.00292.5263%0.052964.2596%0.9263%
GPU722641.158365.6250%140002200000.00311.4671%1.161466.1293%0.5043%
Difference+4+18.2384+2.0221%+2986000+99780000+1.0193+6.5738%+19.2577+4.1192%+4.1192%

Known prime factors (1 factor, 73.7 bits, 0.00239677% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
3072947148349508512732118470172373.6512413798684336764
22 × 34 × 37 × 201351241603
2020-11-18812013512416031,207.81,353.82,528.6

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2004-02-14T00:00:00ANONYMOUSv4_computers2048204800---0.002--0.249%
2010-09-21T07:05:00markrtiny1100002447500---0.029--2.668%
2016-10-23T05:57:15Squeeky_SquirrelP4_2600195000546000012---0.059--3.517%
2017-01-04T22:58:53Jocelyn Larouchelow 4M132000132000---0.016--1.001%
2018-01-30T07:10:49mikrMSI300000010000000012---1.022--8.041%
2022-02-04T00:38:13Jocelyn LaroucheManual testing1000000119912100---0.923--7.475%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-01-13T00:00:00ANONYMOUSv4_computers21259--0.025--
2001-06-23T00:00:00ANONYMOUSv4_computers21260--0.050--
2009-02-13T16:54:00Sturle Sundegoomba.ifi260261--0.050--
2011-10-27T16:50:00Sid & AndyBuzz261262--0.100--
2013-01-07T13:56:00dbaughManual testing262263--0.319--
2015-02-07T18:28:00VictordeHollanderManual testing263264--0.639--
2015-02-07T18:28:00VictordeHollanderManual testing264265--1.216--
2015-06-06T19:31:00ThaManual testing265266--2.432--
2017-05-14T00:43:38Gordon SpenceManual testing266267--4.864--
2018-08-05T23:31:44ramgeisManual testing267268--9.73--


ECM factoring results:

Old Calculation Method

Total ECM effort:3.265 GHz-days
Estimated T-Level:1.400
DigitsB1CurvesCompleteFacMiss
201100028 / 1000.28075.472%
255000028 / 2800.10090.468%

New Calculation Method

Total ECM effort:3.265 GHz-days
Estimated T-Level:1.400
DigitsB1CompleteFacMiss
20110000.90340.526%
25500000.08292.161%
302500000.00599.499%


ECM Summary

B1B2factorcurvesGHz-days
500005000000222.566
50000500000060.700


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-02-01T00:00:00ANONYMOUSv4_computers4A3953FAB099EA170.262
1999-08-31T00:00:00ANONYMOUSv4_computers4A3953FAB099EA170.262


PRP results:
dateuseridcompidcofactorsres64PRP
2020-11-19T14:25:00rbanovccg_lnx01
14834950851273211847017
63DD998CBB82E722no


P-1 factor-bounds graph:
B1 = 3000000, B2 = 100000000 (P-1 stage 2)
B1 = 1000000, B2 = 119912100 (P-1 stage 2)
B1 = 3000000 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
B1 = 195000, B2 = 5460000 (P-1 stage 2)
B1 = 110000, B2 = 2447500 (P-1 stage 2)
B1 = 195000 (P-1 stage 1)
B1 = 132000 (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: 2022-02-04T00:38:13+00:00