is 2 2194663 - 1
has 660660 decimal digits
takes 0.144 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L41B94ADAC05A9DB8double-checked
PRP960E08951F536B9Bverified PRP

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual273871.589169.8630%60000001800000001.47586.0068%873.064971.6733%1.8103%
PrimeNet2580.017562.0690%100001800000.00182.8618%0.019363.1545%1.0855%
GPU722620.279964.5161%110001600000.00181.5708%0.281865.0735%0.5574%
Difference+11+871.3092+5.3469%+5989000+179840000+1.4740+4.4360%+872.7832+6.5998%+6.5998%

Known prime factors (1 factor, 74.7 bits, 0.00340147% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
2194663296588486336968572148812374.6516757039380008880
24 × 32 × 5 × 2477 × 3788767427
2021-05-25247737887674272,716.819.68036.756

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-03-16T00:00:00ANONYMOUSv4_computers2048204800---0.001--0.074%
2010-11-05T01:16:00Jocelyn LaroucheManual testing1500015000---0.001--0.078%
2010-11-09T10:51:00Jocelyn LaroucheManual testing3000030000---0.003--0.151%
2011-01-11T10:43:00markrtiny900001620000---0.017--1.174%
2012-12-16T08:21:00Squeeky_SquirrelT7500_22001600004520000---0.038--1.752%
2017-01-10T10:25:16Jocelyn Larouchelow 4M230400230400---0.022--0.654%
2017-04-04T20:17:34Jocelyn Larouchelow 4M33177633177606---0.047--1.875%
2017-12-16T02:48:39Sid & AndyHand_In_The_Box600000018000000012---1.476--6.007%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-01-29T00:00:00ANONYMOUSv4_computers21258--0.017--
2016-02-23T16:29:08Mark RoseManual testing258260--0.052--
2009-01-03T03:16:00Sturle Sundegicy.ifi260261--0.070--
2009-01-08T15:49:00Sturle Sundeagrell.ifi261262--0.140--
2012-07-15T17:18:00dbaughManual testing262263--0.447--
2012-07-16T06:01:00dbaughManual testing263264--0.895--
2012-07-18T07:13:00dbaughManual testing264265--1.702--
2012-07-18T07:17:00dbaughManual testing265266--3.405--
2012-07-23T04:49:00dbaughManual testing266267--6.810--
2012-07-23T07:04:00dbaughManual testing267268--13.62--
2012-07-29T13:38:00dbaughManual testing268269--27.24--
2012-08-15T08:43:00dbaughManual testing269270--54.48--
2012-10-26T08:00:00dbaughManual testing270271--109.0--
2013-01-03T08:49:00dbaughManual testing271272--217.9--
2013-02-23T08:46:00dbaughManual testing272273--435.8--


ECM factoring results:

Old Calculation Method

Total ECM effort:14.040 GHz-days
Estimated T-Level:22.911
DigitsB1CurvesCompleteFacMiss
2011000163 / 1001.63019.433%
2550000163 / 2800.58255.812%

New Calculation Method

Total ECM effort:14.040 GHz-days
Estimated T-Level:22.911
DigitsB1CompleteFacMiss
20110006.2920.185%
25500000.58255.868%
302500000.03796.393%
3510000000.00299.828%


ECM Summary

B1B2factorcurvesGHz-days
50000500000015213.01
50000515000040.347
50000675000070.685


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-02-14T00:00:00ANONYMOUSv4_computers41B94ADAC05A9DB80.144
2018-04-15T12:47:27kkmrkkblmbrbkold41B94ADAC05A9DB80.144


PRP results:
dateuseridcompidcofactorsres64PRP
2021-05-26T11:13:03tottenhoff2018pc
29658848633696857214881
960E08951F536B9Bno


P-1 factor-bounds graph:
B1 = 6000000, B2 = 180000000 (P-1 stage 2)
B1 = 6000000 (P-1 stage 1)
B1 = 331776, B2 = 3317760 (P-1 stage 2)
B1 = 160000, B2 = 4520000 (P-1 stage 2)
B1 = 331776 (P-1 stage 1)
B1 = 230400 (P-1 stage 1)
B1 = 90000, B2 = 1620000 (P-1 stage 2)
B1 = 160000 (P-1 stage 1)
B1 = 90000 (P-1 stage 1)
B1 = 30000 (P-1 stage 1)
B1 = 15000 (P-1 stage 1)
B1 = 2048, B2 = 204800 (P-1 stage 2)
B1 = 2048 (P-1 stage 1)
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1010
TF factor-bounds graph:
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Last modified: 2021-05-26T11:13:03+00:00