is 2 1950419 - 1
has 587135 decimal digits
takes 0.106 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
Actual26715.234668.6567%500000150000000.10155.1076%15.336170.2576%1.6009%
PrimeNet2580.019763.7931%80001400000.00122.4669%0.020964.6863%0.8932%
GPU722620.315066.1290%8000900000.00101.1532%0.316066.5196%0.3906%
Difference+5+14.9196+2.5277%+492000+14910000+0.1005+3.9545%+15.0201+3.7380%+3.7380%

Known prime factors (4 factors, 184.2 bits, 0.00944242% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
19504193900839721.8951
1
-111.433e-137.866e-81.601e-7
195041915603353823.8954
22
2008-07-15445.735e-133.146e-76.404e-7
19504192055554925562923068472167.47852695213837717
3 × 11 × 1596824661749
2020-11-2211159682466174916.2206,843.612,782
195041922000930167758779203112270.898564005225742745
5 × 359 × 10457 × 30047723
2021-09-011045730047723131.140.12960.2405

11 Composite Factors:
exponentprime factorscomposite factordigitsbits*
1950419608661679131671445.791
19504198018388820277947259487446332789.373
195041932073549114447012349180579912891.373
195041985822086434669988507880409292892.793
1950419343288279735889450755184027832994.793
19504191251137512540503692051652241555444935113.269
195041913391123098366672691944013079363493736116.689
195041945224120373302465922169299668545902566941742138.376
1950419176412012492872817865368968749750930023326294086349160.271
1950419705647914299130151554078108491104714455597475520149162.271
195041927526189043667045612580584946483324232322584008103
513639
56184.167
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:19:13alpertronManual testing5000001500000012-
skipped known factor: 3900839
skipped known factor: 15603353
--0.101--5.108%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2008-07-15T07:48:00J FeitsmaManual testing??23.89584.96071e-160.2351.10011e-15


ECM factoring results:

Old Calculation Method

Total ECM effort:21.074 GHz-days
Estimated T-Level:24.589
DigitsB1CurvesCompleteFacMiss
2011000257 / 1002.5707.555%
2550000257 / 2800.91839.872%

New Calculation Method

Total ECM effort:21.074 GHz-days
Estimated T-Level:24.589
DigitsB1CompleteFacMiss
20110009.0760.011%
25500000.80744.609%
302500000.05095.117%
3510000000.00299.770%


ECM Summary

B1B2factorcurvesGHz-days
500005000000181.252
50000500000060.417
50000650000020.156
500006750000141.111
50000750000021718.14


Lucas-Lehmer results:
No L-L results for M1950419


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-05T05:28:34Oliver KruseGTX-1
3900839
15603353
8A3552F3079736__no
2017-11-11T12:22:26kkmrkkblmbrbkc4.xlarge
3900839
15603353
8A3552F3079736__no
2020-11-22T07:59:32SRJ2877LTOS
3900839
15603353
205555492556292306847
606AC3C4D21D0B59no
2021-09-02T00:18:52Team_InspectorPurple
3900839
15603353
205555492556292306847
2200093016775877920311
606AC3C4D21D0B59no


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
1012
1013
TF factor-bounds graph:
267
2
220
230
240
250
260
270
280
290
2100
Last modified: 2022-04-28T10:18:13+00:00