is 2 12731681 - 1
has 3832618 decimal digits
takes 5.201 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L-unknown--unknown-
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbability
Actual27275.114566.6667%25000000960593142603,113.767716.7205%3,188.882272.2402%
Target2684.681664.7059%90000120000000.43763.1591%5.119365.8209%
Difference+4+70.4329+1.9608%+24910000+96047314260+3,113.3301+13.5614%+3,183.7630+6.4193%

Known prime factors (6 factors, 330.0 bits, 0.00259182% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
12731681101853449926.6024
22
-447.028e-132.369e-64.822e-6
12731681407413793928.60216
24
2008-09-0816162.819e-129.477e-61.929e-5
1273168131574568891031.556124
22 × 31
2008-09-084312.307e-113.240e-64.822e-6
1273168145834051611032.094180
22 × 32 × 5
2008-09-08994.669e-115.331e-61.085e-5
127316817281784416305121431859.33728597105191
3 × 73 × 130580389
2015-11-12731305803890.00974.21387.8701
12731681494261451597373579291630224366218857687730203946151.792194106909997734619368656120258675526699
3 × 41 × 281 × 1321 × 3037 × 4759 × 10103 × 25391 × 35327 × 78857 × 411613
2022-05-05788574116131.117e+100.05740.0951

57 Composite Factors:
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2022-05-04nordisweet16_30.8b14400000400000-
skipped known factor: 101853449
skipped known factor: 407413793
skipped known factor: 3157456889
skipped known factor: 4583405161
--0.237--1.337%
2022-05-05nordisweet16_30.8b1440000042845985046151.79214.0510.4028.106.442%
2022-10-11Naegi Makoto5950X2500000096059314260-
skipped known factor: 101853449
skipped known factor: 407413793
skipped known factor: 3157456889
skipped known factor: 4583405161
skipped known factor: 728178441630512143
skipped known factor: 4942614515973735792916302243662188576877302039
--3,114--16.721%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-09-08Will EdgingtonManual testing??31.556106.03097e-1315.211.76394e-12
2008-09-08Will EdgingtonManual testing??28.60299.72738e-1515.212.84507e-14
2008-09-08Will EdgingtonManual testing??32.094101.75093e-1215.215.12112e-12
2015-11-12TJAOIManual testing259260*59.337180.00415.200.011
2022-10-01LordJuliusManual testing2126426.60297.02803e-1315.212.05556e-12
2022-10-01LordJuliusManual testing2126431.556102.30733e-1115.216.74849e-11
2022-10-01LordJuliusManual testing2126428.60292.81851e-1215.218.24358e-12
2022-10-01LordJuliusManual testing2126455.204170.00015.210.001
2022-10-01LordJuliusManual testing2126432.094104.66914e-1115.211.36563e-10
2022-10-01LordJuliusManual testing2126458.696180.00415.200.011
2022-10-01LordJuliusManual testing2126459.337180.01015.200.028
2022-10-01LordJuliusManual testing2126460.158190.02015.190.058
2022-10-01LordJuliusManual testing2126463.650200.26414.930.757
2022-10-01LordJuliusManual testing2126460.696190.02015.190.059
2022-10-01LordJuliusManual testing2126458.158180.00615.200.017
2022-10-01LordJuliusManual testing264265--0.293--
2022-10-01LordJuliusManual testing265266--0.587--
2022-10-01LordJuliusManual testing266267--1.174--
2022-09-30Naegi MakotoManual testing267268--2.348--
2022-10-01LordJuliusManual testing267268--2.348--
2022-09-30Naegi MakotoManual testing268269--4.696--
2022-09-30Naegi MakotoManual testing269270--9.391--
2022-09-30Naegi MakotoManual testing270271--18.78--
2022-09-30Naegi MakotoManual testing271272--37.56--


ECM factoring results:
No ECM results for M12731681


Lucas-Lehmer results:
No L-L results for M12731681


PRP results:
dateuseridcompidcofactorsres64PRP
2022-05-05XZT7060Micro2
101853449
407413793
3157456889
4583405161
728178441630512143
B6179F3864590F05no
2022-05-16FlaukrotistLenovo
101853449
407413793
3157456889
4583405161
728178441630512143
4942614515973735792916302243662188576877302039
B6179F3864590F05no


P-1 factor-bounds graph:
B1 = 25000000, B2 = 96059314260 (P-1 stage 2)
B1 = 25000000 (P-1 stage 1)
B1 = 400000, B2 = 428459850 (P-1 stage 2)
B1 = 400000 (P-1 stage 1)
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TF factor-bounds graph:
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271
270
269
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267
266
265
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260
2
this exponent TF target: 68
TF double-checked to: 67.9
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Last modified: 2023-09-25T11:53:03+00:00