is 2 1622947 - 1
has 488556 decimal digits
takes 0.072 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L52B581CC77FCF516double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26718.308668.6567%1000000200000000.13185.6771%18.440470.4361%1.7794%
PrimeNet2570.011863.1579%70001200000.00092.5552%0.012764.0993%0.9414%
GPU722610.189365.5738%6500600000.00061.0597%0.189965.9386%0.3648%
Difference+6+18.1193+3.0829%+993500+19940000+0.1312+4.6174%+18.2505+4.4975%+4.4975%

Known prime factors (1 factor, 78.4 bits, 0.00482942% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
16229473929942557740640009169832478.379121074272842570953
3 × 31 × 349 × 19463 × 191660983
2016-07-301946319166098339,4580.67751.2632

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-12-01T13:12:00BigBrotherWinston100000020000000---0.132--5.677%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-11-07T00:00:00ANONYMOUSv4_computers21257--0.012--
2003-07-06T00:00:00ANONYMOUSv4_computers21258--0.024--
2016-02-23T16:28:41Mark RoseManual testing258260--0.071--
2010-05-05T12:40:00Architects Cubeda3_lm260261--0.095--
2016-02-23T16:28:41Mark RoseManual testing261262--0.189--
2010-08-13T02:23:00GrunwalderGIMPManual testing21263--0.983--
2016-02-23T16:28:41Mark RoseManual testing262263--0.605--
2015-04-29T10:57:00omylistManual testing263264--1.210--
2015-04-30T14:35:00monstManual testing264265--2.302--
2015-10-11T16:52:46ramgeisManual testing265266--4.604--


ECM factoring results:

Old Calculation Method

Total ECM effort:14.093 GHz-days
Estimated T-Level:24.482
DigitsB1CurvesCompleteFacMiss
2011000251 / 1002.5108.025%
2550000251 / 2800.89640.737%

New Calculation Method

Total ECM effort:14.093 GHz-days
Estimated T-Level:24.482
DigitsB1CompleteFacMiss
20110008.0970.030%
25500000.73248.105%
302500000.04595.594%
3510000000.00299.794%


ECM Summary

B1B2factorcurvesGHz-days
50000500000025014.04
50000500000010.056


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-11-07T00:00:00ANONYMOUSv4_computers52B581CC77FCF5160.072
2015-06-27T00:56:00MadPooManual testing52B581CC77FCF5160.072


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-02T14:26:54Oliver KruseGTX-1
392994255774064000916983
EB54A2C7A8E501__no
2017-11-01T17:47:29kkmrkkblmbrbkold
392994255774064000916983
EB54A2C7A8E501__no


P-1 factor-bounds graph:
B1 = 1000000, B2 = 20000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
109
TF factor-bounds graph:
267
266
265
264
263
262
261
260
258
257
250
260
270
280
290
2100
Last modified: 2019-10-28T14:12:46+00:00