is 2 260551 - 1
has 78434 decimal digits
takes 0.002 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L1EB383EF8BD1276Adouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual267114.042673.1343%323809206476184000.653010.4279%114.695675.9358%2.8015%
PrimeNet2400.000055.0000%2800700000.000114.4070%0.000161.4832%6.4832%
GPU722440.000059.0909%50001200000.000110.5553%0.000163.4090%4.3181%
Difference+23+114.0426+14.0434%+32375920+647498400+0.6529-0.1275%+114.6955+12.5268%+12.5268%

Known prime factors:
No known factors for M260551

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-01-21T00:00:00ANONYMOUSv4_computers950003800000---0.003--2.206%
2001-06-17T00:00:00ANONYMOUSv4_computers10000010000000---0.006--2.729%
2002-06-02T00:00:00ANONYMOUSv4_computers327683276800---0.002--1.564%
2002-08-10T00:00:00ANONYMOUSv4_computers655366553600---0.004--2.248%
2003-03-07T00:00:00ANONYMOUSv4_computers13107213107200---0.008--3.060%
2003-11-16T00:00:00ANONYMOUSv4_computers26214426214400---0.017--3.989%
2011-02-11T22:33:00Jocelyn LaroucheManual testing20000002000000---0.020--2.615%
2012-02-26T15:18:00Jocelyn LaroucheManual testing23751632375163---0.024--2.781%
2013-10-21T13:26:00David Campeaui5-2500k240500081770000---0.067--6.461%
2016-01-06T19:32:57Jocelyn LaroucheManual testing3238092032380920012---0.478--9.406%
2016-06-27T18:36:37Jocelyn LaroucheManual testing3238092064761840012---0.653--10.428%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-11-24T00:00:00ANONYMOUSv4_computers252253--0.002--
2000-04-27T00:00:00ANONYMOUSv4_computers21254--0.009--
2022-03-07T05:52:32LordJuliusManual testing254255--0.009--
2001-01-21T00:00:00ANONYMOUSv4_computers21256--0.037--
2002-03-24T00:00:00ANONYMOUSv4_computers21257--0.074--
2004-02-07T00:00:00ANONYMOUSv4_computers21258--0.147--
2009-01-01T22:34:00Sturle Sundegouache.ifi258259--0.147--
2009-01-30T06:59:00Sturle Sundegooch.ifi259260--0.295--
2013-07-12T19:46:00lycornasteroid260261--0.589--
2015-08-25T13:23:00NRManual testing261262--1.179--
2015-12-05T08:52:55Gordon SpenceManual testing262263--3.768--
2015-12-05T08:52:55Gordon SpenceManual testing263264--7.535--
2018-03-18T14:58:19Gordon SpenceManual testing264265--14.34--
2020-01-02T22:39:46Gordon SpenceManual testing265266--28.68--


ECM factoring results:

Old Calculation Method

Total ECM effort:23.374 GHz-days
Estimated T-Level:29.570
DigitsB1CurvesCompleteFacMiss
2011000866 / 1008.6600.017%
2550000866 / 2803.0934.512%
30250000585 / 6400.91440.061%

New Calculation Method

Total ECM effort:23.374 GHz-days
Estimated T-Level:29.570
DigitsB1CompleteFacMiss
201100057.8150.000%
25500007.8670.038%
302500000.81144.433%
3510000000.06693.650%
4030000000.00499.568%


ECM Summary

B1B2factorcurvesGHz-days
5000050000002812.049
2500002500000058521.33


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2016-06-01T06:39:04MadPooManual testing1EB383EF8BD1276A0.002


PRP results:
No PRP results for M260551


P-1 factor-bounds graph:
B1 = 32380920, B2 = 647618400 (P-1 stage 2)
B1 = 32380920, B2 = 323809200 (P-1 stage 2)
B1 = 32380920 (P-1 stage 1)
B1 = 2405000, B2 = 81770000 (P-1 stage 2)
B1 = 2405000 (P-1 stage 1)
B1 = 2375163 (P-1 stage 1)
B1 = 2000000 (P-1 stage 1)
B1 = 262144, B2 = 26214400 (P-1 stage 2)
B1 = 131072, B2 = 13107200 (P-1 stage 2)
B1 = 100000, B2 = 10000000 (P-1 stage 2)
B1 = 65536, B2 = 6553600 (P-1 stage 2)
B1 = 95000, B2 = 3800000 (P-1 stage 2)
B1 = 262144 (P-1 stage 1)
B1 = 32768, B2 = 3276800 (P-1 stage 2)
B1 = 131072 (P-1 stage 1)
B1 = 100000 (P-1 stage 1)
B1 = 95000 (P-1 stage 1)
B1 = 65536 (P-1 stage 1)
B1 = 32768 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-03-07T05:52:32+00:00