is 2 1902611 - 1
has 572743 decimal digits
takes 0.103 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
Actual26715.617468.6567%20000002620000001.27169.2339%16.889171.5509%2.8942%
PrimeNet2570.010163.1579%90001600000.00143.0388%0.011464.2774%1.1196%
GPU722610.161565.5738%100001600000.00141.7278%0.162966.1686%0.5948%
Difference+6+15.4560+3.0829%+1990000+261840000+1.2702+7.5061%+16.7262+5.3823%+5.3823%

Known prime factors (4 factors, 158.5 bits, 0.00833259% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
19026113805223721.8601
1
-111.469e-137.866e-81.601e-7
190261115220889823.8604
22
2008-07-15445.879e-133.146e-76.404e-7
1902611232672734532091444.4036114564
22 × 32 × 31 × 5479
2008-09-303154791.846e-62.579e-54.386e-5
19026113933456449898146234172168.414103369959752628
22 × 3 × 239 × 1277 × 28224373
2020-10-1912772822437359.8110.12110.2259

11 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1902611579188769032471445.719
1902611885371640914403106072066.263
19026113541485865639408828012168.263
190261113476143470105988178746696232890.122
190261114967678952650773707627069912890.274
190261159870704010233745136069577132892.274
1902611915208068360688548262442750519515334112.818
19026112278213799259336823679100844953499935114.133
19026113482570791511664359684857190460121568411941134.677
190261113930280420422452356673783974512234715101742136.677
190261153007823452241185424019286276845369319303436179148158.537
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:40:50alpertronManual testing5000001500000012-
skipped known factor: 3805223
skipped known factor: 15220889
skipped known factor: 23267273453209
--0.101--5.092%
2021-06-30T09:06:10Dylan Delgadolaptop-i787502000000262000000-
skipped known factor: 3805223
skipped known factor: 15220889
skipped known factor: 23267273453209
skipped known factor: 393345644989814623417
--1.272--9.234%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-09-30T13:30:00markrManual testing??44.403146.14291e-70.2201.30895e-6
2008-07-15T07:48:00J FeitsmaManual testing??23.86085.08536e-160.2201.08362e-15


ECM factoring results:

Old Calculation Method

Total ECM effort:19.835 GHz-days
Estimated T-Level:24.607
DigitsB1CurvesCompleteFacMiss
2011000258 / 1002.5807.480%
2550000258 / 2800.92139.729%

New Calculation Method

Total ECM effort:19.835 GHz-days
Estimated T-Level:24.607
DigitsB1CompleteFacMiss
20110008.8080.015%
25500000.79745.052%
302500000.04995.188%
3510000000.00299.773%


ECM Summary

B1B2factorcurvesGHz-days
500005000000352.428
50000500000010.069
50000560000070.509
50000660000021516.83


Lucas-Lehmer results:
No L-L results for M1902611


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T19:02:45Oliver KruseGTX-0
3805223
15220889
23267273453209
B09344764B035F__no
2017-11-09T07:58:10kkmrkkblmbrbkc4.large
3805223
15220889
23267273453209
B09344764B035F__no
2020-10-20T08:22:02tottenhoff3-of-4-Ryzen-5-3600
3805223
15220889
23267273453209
393345644989814623417
71C12ED7458A437Eno


P-1 factor-bounds graph:
B1 = 2000000, B2 = 262000000 (P-1 stage 2)
B1 = 2000000 (P-1 stage 1)
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
101
102
103
104
105
106
107
100
101
102
103
104
105
106
107
108
109
TF factor-bounds graph:
267
2
220
230
240
250
260
270
280
290
2100
Last modified: 2021-12-17T10:36:46+00:00