is 2 62173087 - 1
has 18715965 decimal digits
takes 146.049 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
Actual27330.766464.3836%585000108225003.89244.1598%34.658965.8651%1.4816%
PrimeNet2703.843362.8571%260000120000003.06435.1444%6.907664.7679%1.9108%
GPU7227461.535764.8649%400000130000003.70073.7231%65.236566.1730%1.3081%
Difference-1-30.7693-0.4813%+185000-2177500+0.1917+0.4367%-30.5776-0.3079%-0.3079%

Known prime factors (1 factor, 88.8 bits, 0.00014282% known):
Remaining cofactor is PRP status unknown

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
621730875380843000468381018932850092788.7984327308856699025592
23 × 3 × 127 × 3019 × 233911 × 2010431
2013-05-0523391120104311,783,4201.12641.6215

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2013-05-05T22:50:00Jwb52zClay585000108225002788.7983.892292.17.7854.160%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-06-30T00:00:00ANONYMOUSv4_computers21259--0.001--
2022-03-30T00:00:06LordJuliusManual testing21263--0.026--
2008-12-22T02:12:00DerekDerek_Desk263264--0.032--
2009-08-12T18:05:00ColinColin1264265--0.060--
2009-10-14T03:08:00Sturle Sundehoffman.ifi265266--0.120--
2009-10-19T08:00:00Helmut Zulusvibra266267--0.240--
2009-10-24T18:42:00Helmut Zulusvibra267268--0.481--
2009-12-30T16:20:00Per Jessenbluewood268269--0.962--
2011-12-07T08:06:00Stefan269270--1.923--
2012-09-01T21:04:00S00030vd01270271--3.846--
2013-02-17T19:20:00ixfd64Manual testing271272--7.692--
2013-04-03T22:31:00kdgehmanManual testing272273--15.38--


ECM factoring results:
No ECM results for M62173087


Lucas-Lehmer results:
No L-L results for M62173087


PRP results:
No PRP results for M62173087


P-1 factor-bounds graph:
B1 = 585000, B2 = 10822500 (P-1 stage 2)
B1 = 585000 (P-1 stage 1)
104
105
106
104
105
106
107
108
TF factor-bounds graph:
273
272
271
270
269
268
267
266
265
264
263
259
250
260
270
280
290
2100
Last modified: 2022-03-30T00:00:06+00:00