is 2 1942571 - 1
has 584773 decimal digits
takes 0.105 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L817057769CD32D2Edouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.296268.6567%500000150000000.10155.1051%15.397770.2568%1.6001%
PrimeNet2580.019863.7931%80001400000.00122.4649%0.021064.6856%0.8925%
GPU722620.316366.1290%8000900000.00101.1522%0.317266.5193%0.3902%
Difference+5+14.9799+2.5277%+492000+14910000+0.1005+3.9530%+15.0804+3.7376%+3.7376%

Known prime factors (2 factors, 134.6 bits, 0.00693109% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1942571101061123305585933692063.1322601220838404
22 × 19 × 61 × 561091639
2013-12-23615610916391.33442.40474.4913
194257133610397790861956351932271.509865100884108276
22 × 83 × 20177 × 129143359
2021-07-1320177129143359371.660.55501.0337

1 Composite Factors:
exponentprime factorscomposite factordigitsbits*
19425713396704555492093237515893299094555283521741134.641
P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2011-12-11T20:59:00markrtiny2750006000000---0.046--3.947%
2016-03-16T12:42:05alpertronManual testing5000001500000012---0.101--5.105%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
1998-12-21T00:00:00Stargazerv4_computers21258--0.020--
2010-01-26T19:45:00S485122USB-W260261--0.079--
2011-08-27T22:18:00GrunwalderGIMPManual testing21263--0.822--


ECM factoring results:

Old Calculation Method

Total ECM effort:20.810 GHz-days
Estimated T-Level:24.571
DigitsB1CurvesCompleteFacMiss
2011000256 / 1002.5607.631%
2550000256 / 2800.91440.015%

New Calculation Method

Total ECM effort:20.810 GHz-days
Estimated T-Level:24.571
DigitsB1CompleteFacMiss
20110009.0010.012%
25500000.80044.937%
302500000.05095.162%
3510000000.00299.772%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
500005000000402.782
50000500000010.070
50000750000021517.96


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-21T00:00:00Stargazerv4_computers817057769CD32D2E0.105


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-05T03:36:47Oliver KruseGTX-1
10106112330558593369
D0D59F4B6074F2__no
2017-11-11T06:07:56kkmrkkblmbrbkc4.xlarge
10106112330558593369
D0D59F4B6074F2__no
2021-07-15T10:43:27GURA LOVE
10106112330558593369
3361039779086195635193
F46D35D3E527DD3Cno


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)
100
101
102
103
104
105
106
100
101
102
103
104
105
106
107
108
109
TF factor-bounds graph:
267
263
261
258
250
260
270
280
290
2100
Last modified: 2022-04-14T10:50:21+00:00