is 2 1894757 - 1
has 570379 decimal digits
takes 0.103 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L8F727BF622681CEAdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.682268.6567%5001005001000.03932.0054%15.721569.2853%0.6286%
PrimeNet2570.010163.1579%90001600000.00143.0365%0.011564.2766%1.1187%
GPU722610.162165.5738%100001600000.00141.7264%0.163666.1681%0.5943%
Difference+6+15.5201+3.0829%+490100+340100+0.0379+0.2791%+15.5580+3.1172%+3.1172%

Known prime factors (1 factor, 60.2 bits, 0.00317979% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
189475713703216911430093211960.249361608821380
22 × 5 × 17 × 367 × 2897971
2009-07-2636728979710.13440.01240.0232

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2022-04-12T11:55:40Lisander ViaeneDesktop500100500100---0.039--2.005%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-09T00:00:00ANONYMOUSv4_computers21258--0.020--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.052 GHz-days
Estimated T-Level:24.411
DigitsB1CurvesCompleteFacMiss
2011000247 / 1002.4708.354%
2550000247 / 2800.88241.324%

New Calculation Method

Total ECM effort:19.052 GHz-days
Estimated T-Level:24.411
DigitsB1CompleteFacMiss
201100010.1920.004%
25500000.93839.141%
302500000.06094.220%
3510000000.00399.721%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
500005000000312.150
50000660000020916.35
50000675000070.553


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-02T00:00:00ANONYMOUSv4_computers8F727BF622681CEA0.103


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T17:24:20Oliver KruseGTX-0
1370321691143009321
0FA710BD876A56__no
2017-11-09T02:38:04kkmrkkblmbrbkold
1370321691143009321
0FA710BD876A56__no


P-1 factor-bounds graph:
B1 = 500100 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
TF factor-bounds graph:
267
258
250
260
270
280
290
2100
Last modified: 2022-04-12T11:55:40+00:00