is 2 1227649 - 1
has 369560 decimal digits
takes 0.038 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L121C0CECCB6FAAEEdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26724.203968.6567%300000100000000.03684.1735%24.240869.9648%1.3081%
PrimeNet2560.007862.5000%5500900000.00042.4275%0.008363.4103%0.9103%
GPU722600.125165.0000%5000300000.00030.8301%0.125465.2905%0.2905%
Difference+7+24.0788+3.6567%+295000+9970000+0.0366+3.3433%+24.1154+4.6743%+4.6743%

Known prime factors (1 factor, 63.7 bits, 0.00519213% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1227649154162369119515153692063.7416278764089716
22 × 691 × 2271622319
2009-10-0769122716223191.71415.503410.279

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2002-09-22T00:00:00Jocelyn Larouchev4_computers10001000---4.44667e-5--0.005%
2002-12-09T00:00:00ANONYMOUSv4_computers20000395000---0.002--1.039%
2016-03-17T19:02:32alpertronManual testing3000001000000012---0.037--4.173%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2001-11-14T00:00:00ANONYMOUSv4_computers21257--0.016--
2003-05-26T00:00:00ANONYMOUSv4_computers21258--0.031--
2022-03-07T17:31:40LordJuliusManual testing258260--0.094--
2009-02-15T05:34:00Sturle Sundegolan.ifi260261--0.125--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.645 GHz-days
Estimated T-Level:25.344
DigitsB1CurvesCompleteFacMiss
2011000322 / 1003.2203.931%
2550000322 / 2801.15031.599%
3025000044 / 6400.06993.351%

New Calculation Method

Total ECM effort:19.645 GHz-days
Estimated T-Level:25.344
DigitsB1CompleteFacMiss
201100015.0920.000%
25500001.65619.090%
302500000.13787.221%
3510000000.00999.079%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000500000027810.29
25000035000000449.359


Lucas-Lehmer results:
No L-L results for M1227649


PRP results:
dateuseridcompidcofactorsres64PRP
2017-09-29T16:10:47Oliver KruseGTX-0
15416236911951515369
C0CDB817B8A009__no
2017-10-19T13:58:57kkmrkkblmbrbkc4.xlarge
15416236911951515369
C0CDB817B8A009__no


P-1 factor-bounds graph:
B1 = 300000, B2 = 10000000 (P-1 stage 2)
B1 = 300000 (P-1 stage 1)
B1 = 20000, B2 = 395000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
B1 = 1000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
109
1010
TF factor-bounds graph:
267
261
260
258
257
250
260
270
280
290
2100
Last modified: 2022-03-07T17:31:40+00:00