is 2 15497 - 1
has 4666 decimal digits
takes 0.000 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L37726C2E6F70900Cdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual2671,917.398079.1045%1000000000001000137326772784201,883,124.572340.6018%1,885,041.970387.5884%8.4840%
PrimeNet2400.000065.0000%500100000.00003.4572%0.000066.2100%1.2100%
GPU722440.000268.1818%500100000.00001.4443%0.000268.6414%0.4595%
Difference+23+1,917.3979+10.9227%+99999999500+100013732677268420+1,883,124.5723+39.1575%+1,885,041.9702+18.9471%+18.9471%

Known prime factors:
No known factors for M15497

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2001-04-29T00:00:00ANONYMOUSv4_computers10000010000000---0.000--1.754%
2001-07-29T00:00:00Alex Kruppav4_computers1000000100000000---0.002--4.400%
2001-08-18T00:00:00Alex Kruppav4_computers1000000100000000---0.002--4.400%
2002-04-28T00:00:00ANONYMOUSv4_computers163841638400---3.62019e-5--0.566%
2002-06-09T00:00:00ANONYMOUSv4_computers327683276800---7.24038e-5--0.926%
2002-07-14T00:00:00ANONYMOUSv4_computers655366553600---0.000--1.403%
2003-02-02T00:00:00ANONYMOUSv4_computers13107213107200---0.000--2.002%
2003-03-27T00:00:00ANONYMOUSv4_computers26214426214400---0.001--2.719%
2003-04-03T00:00:00ANONYMOUSv4_computers52428852428800---0.001--3.543%
2003-04-27T00:00:00ANONYMOUSv4_computers1048576104857600---0.002--4.467%
2003-05-19T00:00:00ANONYMOUSv4_computers2097152209715200---0.005--5.482%
2003-07-06T00:00:00ANONYMOUSv4_computers4194304419430400---0.009--6.583%
2003-09-29T00:00:00ANONYMOUSv4_computers8388608838860800---0.019--7.764%
2003-09-29T00:00:00ANONYMOUSv4_computers167772161677721600---0.037--9.014%
2012-10-12T21:13:00Jocelyn LaroucheManual testing544143324544143324---0.188--8.376%
2013-04-28T02:36:00bcp19Toshiba-740Q10000000000100000000000---5.150--17.532%
2018-07-27T10:03:09James Hintz3_1_201822619325179171906871360412---39.76--22.748%
2022-04-01T19:34:14-Anonymous-T5810100000000000100013732677278420---1,883,125--40.602%


P+1 Factoring results:
dateuseridcompidb1b2startfactorSmoothdigitsbits*ghz-days
2021-05-10T19:25:28ATH5960X100000000024100000000027--4.954


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1999-09-22T00:00:00ANONYMOUSv4_computers252253--0.039--
2000-03-08T00:00:00ANONYMOUSv4_computers253254--0.077--
2000-09-23T00:00:00ANONYMOUSv4_computers21256--0.619--
2002-10-07T00:00:00ANONYMOUSv4_computers21257--1.239--
2016-02-23T04:50:33LaurVManual testing257258--1.239--
2010-06-27T16:58:00George WoltmanManual testing258259--2.478--
2010-07-04T17:49:00George WoltmanManual testing259260--4.955--
2012-12-25T15:33:00bcp19Manual testing260261--9.91--
2015-08-13T13:38:00snme2pm1G1261262--19.82--
2016-07-08T04:15:44Sid & AndyWoody262263--63.34--
2018-09-14T02:30:37snme2pm1g10263264--126.7--
2019-05-07T16:30:15Anton RepkoManual testing264265--241.1--
2021-12-18T14:08:11Ruslan BorisovManual testing265266--482.2--


ECM factoring results:

Old Calculation Method

Total ECM effort:921.973 GHz-days
Estimated T-Level:43.545
DigitsB1CurvesCompleteFacMiss
20110007317 / 10073.1700.000%
25500007317 / 28026.1320.000%
302500007317 / 64011.4330.001%
3510000007317 / 15664.6720.934%
4030000006624 / 45881.44423.600%
45110000006524 / 92010.70949.209%
50440000001220 / 165500.07492.893%

New Calculation Method

Total ECM effort:921.973 GHz-days
Estimated T-Level:43.545
DigitsB1CompleteFacMiss
20110002,244.8330.000%
2550000704.3710.000%
30250000183.9470.000%
35100000039.2650.000%
4030000007.1760.076%
45110000001.14931.690%
50440000000.16484.841%
551100000000.02297.872%
602600000000.00399.742%


ECM Summary

B1B2factorcurvesGHz-days
10000001000000006933.446
30000003000000001001.492
11000000110000000080443.98
1100000060000000004,500602.8
4400000044000000001,210264.8
11000000011000000000105.470


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2015-04-11T05:57:00MadPooManual testing37726C2E6F70900C3.69345e-6


PRP results:
No PRP results for M15497


P-1 factor-bounds graph:
B1 = 100000000000, B2 = 100013732677278420 (P-1 stage 2)
B1 = 22619325179, B2 = 1719068713604 (P-1 stage 2)
B1 = 100000000000 (P-1 stage 1)
B1 = 22619325179 (P-1 stage 1)
B1 = 10000000000, B2 = 100000000000 (P-1 stage 2)
B1 = 10000000000 (P-1 stage 1)
B1 = 544143324 (P-1 stage 1)
B1 = 16777216, B2 = 1677721600 (P-1 stage 2)
B1 = 8388608, B2 = 838860800 (P-1 stage 2)
B1 = 4194304, B2 = 419430400 (P-1 stage 2)
B1 = 16777216 (P-1 stage 1)
B1 = 2097152, B2 = 209715200 (P-1 stage 2)
B1 = 8388608 (P-1 stage 1)
B1 = 1048576, B2 = 104857600 (P-1 stage 2)
B1 = 1000000, B2 = 100000000 (P-1 stage 2)
B1 = 4194304 (P-1 stage 1)
B1 = 524288, B2 = 52428800 (P-1 stage 2)
B1 = 2097152 (P-1 stage 1)
B1 = 262144, B2 = 26214400 (P-1 stage 2)
B1 = 1048576 (P-1 stage 1)
B1 = 1000000 (P-1 stage 1)
B1 = 131072, B2 = 13107200 (P-1 stage 2)
B1 = 100000, B2 = 10000000 (P-1 stage 2)
B1 = 524288 (P-1 stage 1)
B1 = 65536, B2 = 6553600 (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 = 16384, B2 = 1638400 (P-1 stage 2)
B1 = 100000 (P-1 stage 1)
B1 = 65536 (P-1 stage 1)
B1 = 32768 (P-1 stage 1)
B1 = 16384 (P-1 stage 1)
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TF factor-bounds graph:
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Last modified: 2022-04-01T19:34:14+00:00