is 2 25171943 - 1
has 7577510 decimal digits
takes 21.571 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L590291B1AFFC4F98double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual274151.989366.2162%30000075000000.86022.8260%152.849567.1709%0.9547%
PrimeNet2660.586762.1212%11000040000000.40004.9821%0.986764.0084%1.8872%
GPU722709.492764.2857%18000055000000.58383.7361%10.076665.6200%1.3343%
Difference+4+142.4966+1.9305%+120000+2000000+0.2764-0.9101%+142.7729+1.5509%-0.3796%

Known prime factors:
No known factors for M25171943

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2004-08-06T00:00:00Grey Smithv4_computers3000007500000---0.860--2.826%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-08-12T00:00:00Net_Forcev4_computers21256--0.000--
2001-08-24T00:00:00Mattv4_computers21258--0.002--
2003-12-13T00:00:00markrv4_computers21262--0.024--
2004-04-09T00:00:00Lars Frickev4_computers21267--1.180--
2016-01-04T21:26:00VictordeHollanderManual testing267268--1.187--
2017-06-12T02:12:11ramgeisManual testing268269--2.375--
2017-06-12T02:12:11ramgeisManual testing269270--4.750--
2021-06-07T19:30:27mikrManual testing270271--9.500--
2021-08-28T20:32:00TheJudgerManual testing271272--19.00--
2021-08-28T20:32:00TheJudgerManual testing272273--38.00--
2021-09-13T17:08:30TheJudgerManual testing273274--76.00--


ECM factoring results:
No ECM results for M25171943


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
2004-09-02T00:00:00Grey Smithv4_computers590291B1AFFC4F9821.57
2005-05-12T00:00:00Stephan Gruppv4_computers590291B1AFFC4F9821.57
2005-09-22T00:00:00Stephan Gruppv4_computers590291B1AFFC4F9821.57


PRP results:
No PRP results for M25171943


P-1 factor-bounds graph:
B1 = 300000, B2 = 7500000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
104
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106
104
105
106
107
TF factor-bounds graph:
274
273
272
271
270
269
268
267
262
258
256
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260
270
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290
2100
Last modified: 2021-09-13T17:08:30+00:00