is 2 1976371 - 1
has 594947 decimal digits
takes 0.130 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
-unknown- primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.034668.6567%----15.034668.6567%0.0000%
PrimeNet2580.019463.7931%80001400000.00142.4732%0.020964.6886%0.8955%
GPU722620.310966.1290%80001000000.00121.1967%0.312166.5344%0.4053%
Difference+5+14.7237+2.5277%-8000-100000-0.0012-1.1967%+14.7225+2.1223%+2.1223%

Known prime factors (4 factors, 237.4 bits, 0.01201381% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1976371135317537189291443.6213423384
23 × 36 × 587
-7297291.181e-66.950e-50.0001
1976371372594966473961611755.0489426240480
25 × 3 × 5 × 19 × 337 × 3067
2015-01-0233730670.00444.631e-56.539e-5
1976371624008050809602305272065.75815786713395653
3 × 5262237798551
2019-04-23352622377985515.682627,33351,051
197637195062787023167060131692273.0092404983351384104
23 × 127 × 6323 × 374364953
2021-12-2763233743649531,215.91.94513.6319

11 Composite Factors:
exponentprime factorscomposite factordigitsbits*
19763715041863323238256090161076315693098.670
197637184439232621844723836408140354558333109.380
197637112863662218324963472166479259857600136116.631
1976371232502258770885903820278182885480684737120.807
197637135419915943818283570674358191522604420939128.058
197637159319944434854833536355712883444933781006342138.768
19763713146163304782328037571992709703925655307022270686350164.428
197637147929357929691563973565824766255623721348131141321
61
52171.679
197637180270287871300853087583264633637094060811614128897
82527
55182.389
197637122102312707942002285868453624886074275941596955474
933368143
59193.816
197637129908305218262588606584306632103450632741602555545
5153631807516104678847
72237.437
P-1 results:
No P-1 results for M1976371


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2015-01-02T12:37:00TJAOIManual testing255256*55.048170.0020.2790.004
2022-03-09T05:51:28LordJuliusManual testing2126143.621141.18119e-60.2832.57660e-6
2022-03-09T05:51:28LordJuliusManual testing2126155.048170.0040.2790.009
2022-03-09T05:51:28LordJuliusManual testing261262--0.155--
2022-03-09T05:51:28LordJuliusManual testing262263--0.497--
2022-03-09T05:51:28LordJuliusManual testing263264--0.993--
2022-03-09T05:51:28LordJuliusManual testing264265--1.891--
2019-04-23T13:34:39TJAOIManual testing265266*65.758201.9910.2644.046


ECM factoring results:

Old Calculation Method

Total ECM effort:3.830 GHz-days
Estimated T-Level:2.100
DigitsB1CurvesCompleteFacMiss
201100042 / 1000.42065.566%
255000042 / 2800.15086.048%

New Calculation Method

Total ECM effort:3.830 GHz-days
Estimated T-Level:2.100
DigitsB1CompleteFacMiss
20110001.41024.423%
25500000.12688.146%
302500000.00899.224%


ECM Summary

B1B2factorcurvesGHz-days
50000500000060.507
50000500000080.676
500006037912141.281
50000675000070.675
50000709949670.691


Lucas-Lehmer results:
No L-L results for M1976371


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-05T11:57:56Oliver KruseGTX-3
13531753718929
37259496647396161
73462ADAE81969__no
2017-11-12T12:19:40kkmrkkblmbrbkold
13531753718929
37259496647396161
73462ADAE81969__no
2019-04-25T16:40:29oodairacom1
13531753718929
37259496647396161
62400805080960230527
FAEEBCE2BD9FE4A7no
2019-04-25T17:07:32ATHec2-PRPCFDC
13531753718929
37259496647396161
62400805080960230527
FAEEBCE2BD9FE4A7no
2021-12-27T12:45:02MarkSdesktop-i7
13531753718929
37259496647396161
62400805080960230527
9506278702316706013169
FAEEBCE2BD9FE4A7no


P-1 factor-bounds graph:
100
101
102
103
104
100
101
102
103
104
105
106
107
108
109
1010
1011
1012
1013
TF factor-bounds graph:
267
266
265
264
263
262
261
256
240
250
260
270
280
290
2100
Last modified: 2022-05-19T21:17:45+00:00