is 2 1885627 - 1
has 567631 decimal digits
takes 0.102 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
Actual26715.758168.6567%500000150000000.10155.0869%15.859670.2511%1.5944%
PrimeNet2570.010263.1579%90001600000.00143.0338%0.011564.2756%1.1177%
GPU722610.162965.5738%100001500000.00141.6924%0.164366.1564%0.5826%
Difference+6+15.5952+3.0829%+490000+14850000+0.1001+3.3944%+15.6953+4.0947%+4.0947%

Known prime factors (3 factors, 145.1 bits, 0.00769604% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
188562756003121911032.3831485
33 × 5 × 11
-27274.010e-102.124e-64.322e-6
18856272084931739893611547.56755284840
23 × 32 × 5 × 13 × 11813
2008-08-2613118131.408e-55.159e-59.458e-5
1885627414732307622429024092065.16910997199011852
22 × 179 × 15359216497
2018-04-21179153592164975.697965.826122.94

4 Composite Factors:
exponentprime factorscomposite factordigitsbits*
188562711676268640329025125999512579.950
18856272322630398379451488643459681193097.552
1885627864688551721322838014515392727064934112.736
18856274842525837623058324379408788846534295118195944145.119
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:40:03alpertronManual testing5000001500000012-
skipped known factor: 5600312191
skipped known factor: 208493173989361
--0.101--5.087%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-08-26T20:20:00ANONYMOUSManual testing??47.567154.13216e-60.2188.81279e-6


ECM factoring results:

Old Calculation Method

Total ECM effort:19.779 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:19.779 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
201100010.6090.002%
25500000.97737.662%
302500000.06293.992%
3510000000.00399.709%


ECM Summary

B1B2factorcurvesGHz-days
500005000000422.911
50000500000020.139
50000660000021416.73


Lucas-Lehmer results:
No L-L results for M1885627


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T14:58:16Oliver KruseGTX-0
5600312191
208493173989361
9037F04F01BA3F__no
2017-11-08T09:49:41kkmrkkblmbrbkc4.xlarge
5600312191
208493173989361
9037F04F01BA3F__no
2018-04-21T05:50:32ATHec2-PRPCF
5600312191
208493173989361
41473230762242902409
316449AAA77B9D__no
2018-04-25T20:25:47Luigi MorelliCS50X-C9
5600312191
208493173989361
41473230762242902409
316449AAA77B9D__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
1010
1011
TF factor-bounds graph:
267
2
230
240
250
260
270
280
290
2100
Last modified: 2021-10-20T13:19:18+00:00