is 2 1911289 - 1
has 575356 decimal digits
takes 0.104 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LD6C9BC7430F1B33Ddouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.546568.6567%20000002620000001.27169.2380%16.818271.5522%2.8955%
PrimeNet2570.010063.1579%90001600000.00143.0413%0.011464.2784%1.1205%
GPU722610.160765.5738%100001700000.00151.7599%0.162266.1797%0.6059%
Difference+6+15.3858+3.0829%+1990000+261830000+1.2701+7.4780%+16.6560+5.3725%+5.3725%

Known prime factors (3 factors, 211.8 bits, 0.01108302% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
191128911484389361484440411959.994300435710180
22 × 5 × 15021785509
-5150217855090.060264.380120.24
19112892052959495699770523932167.47653706150553364
22 × 1212989 × 11068969
2020-11-3012129891106896930.9280.13770.1942
1911289247897570754747283322317912684.3586485088617020955055
3 × 5 × 1657 × 2333 × 141773 × 788849
2015-09-241417737888493,227,8580.01390.0227

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
191128923576986191972906394973277978248564011339127.471
19112892846952224313656041644914322842805360470743144144.352
1911289508923671841864164590031450728258004942722586346151.834
191128958446776027083032784706882504573042519309807909783
58910523432383
64211.829
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2015-09-24T16:54:59alpertronManual testing50000015000000122684.3580.1010.2070.2035.095%
2021-04-07T11:49:45Dylan Delgadodesktoplinux100000071000000-
skipped known factor: 24789757075474728332231791
--0.379--7.166%
2021-07-03T19:24:49Dylan Delgadolaptop-i787502000000262000000-
skipped known factor: 205295949569977052393
skipped known factor: 24789757075474728332231791
--1.272--9.238%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-02-19T00:00:00Wayne Yeungv4_computers21257--0.010--
2003-01-09T00:00:00ANONYMOUSv4_computers21258--0.020--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.832 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:19.832 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
20110008.8030.015%
25500000.79745.048%
302500000.04995.187%
3510000000.00299.773%


ECM Summary

B1B2factorcurvesGHz-days
500005000000392.707
50000500000030.208
50000660000021616.92


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-02-19T00:00:00Wayne Yeungv4_computersD6C9BC7430F1B33D0.104
1998-12-21T00:00:00Smegheadsv4_computersD6C9BC7430F1B33D0.104


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T21:16:52Oliver KruseGTX-0
1148438936148444041
24789757075474728332231791
AFBAED084E117849no
2017-10-05T21:07:50Oliver KruseManual testing
1148438936148444041
24789757075474728332231791
AFBAED084E1178__no
2017-11-15T10:49:29kkmrkkblmbrbkc4.xlarge
1148438936148444041
24789757075474728332231791
AFBAED084E1178__no
2020-12-01T09:14:59Poaopc-Home
1148438936148444041
205295949569977052393
24789757075474728332231791
002808CAE61FAB9Cno


P-1 factor-bounds graph:
B1 = 2000000, B2 = 262000000 (P-1 stage 2)
B1 = 1000000, B2 = 71000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 1000000 (P-1 stage 1)
B1 = 500000 (P-1 stage 1)
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TF factor-bounds graph:
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258
257
250
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2100
Last modified: 2022-02-03T11:48:35+00:00