is 2 1488209 - 1
has 447996 decimal digits
takes 0.066 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-LD2106135E3510E19double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26719.966268.6567%500000150000000.08354.9437%20.049870.2062%1.5495%
PrimeNet2570.012963.1579%65001000000.00082.3367%0.013764.0188%0.8609%
GPU722610.206465.5738%6000500000.00050.9463%0.207065.8995%0.3258%
Difference+6+19.7598+3.0829%+494000+14950000+0.0830+3.9974%+19.8428+4.3067%+4.3067%

Known prime factors (1 factor, 68.6 bits, 0.00460694% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
14882094353790015019833374312168.561146276161984635
3 × 5 × 43 × 20693 × 10959491
2014-09-09206931095949143.3120.03990.0722

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2003-09-29T00:00:00Team Prime Ribv4_computers20000270000---0.002--0.964%
2011-12-05T18:38:00markrtiny2750006000000---0.038--3.811%
2016-03-17T19:15:19alpertronManual testing5000001500000012-
skipped known factor: 435379001501983337431
--0.084--4.944%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-07-30T00:00:00ANONYMOUSv4_computers21258--0.026--
2010-05-07T08:30:00Architects Cubedm1_f2260261--0.103--
2011-05-28T03:14:00GrunwalderGIMPManual testing21263--1.072--


ECM factoring results:

Old Calculation Method

Total ECM effort:30.015 GHz-days
Estimated T-Level:25.391
DigitsB1CurvesCompleteFacMiss
2011000301 / 1003.0104.855%
2550000301 / 2801.07534.064%
3025000050 / 6400.07892.479%

New Calculation Method

Total ECM effort:30.015 GHz-days
Estimated T-Level:25.391
DigitsB1CompleteFacMiss
201100012.2630.000%
25500001.35725.749%
302500000.11389.315%
3510000000.00899.236%


ECM Summary

B1B2factorcurvesGHz-days
50000500000024813.80
50000500000030.167
250000350000005016.05


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-13T00:00:00ANONYMOUSv4_computersD2106135E3510E190.066


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-01T07:28:41Oliver KruseGTX-1
435379001501983337431
7212610D88DE50__no
2017-10-28T18:09:13kkmrkkblmbrbkc4.xlarge
435379001501983337431
7212610D88DE50__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 275000, B2 = 6000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
B1 = 275000 (P-1 stage 1)
B1 = 20000, B2 = 270000 (P-1 stage 2)
B1 = 20000 (P-1 stage 1)
103
104
105
106
103
104
105
106
107
108
TF factor-bounds graph:
267
263
261
258
250
260
270
280
290
2100
Last modified: 2022-02-03T11:46:03+00:00