is 2 1918537 - 1
has 577538 decimal digits
takes 0.104 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L932BF001146560EBdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.487868.6567%500000150000000.10155.0975%15.589370.2544%1.5977%
PrimeNet2570.010063.1579%90001700000.00143.0924%0.011464.2972%1.1393%
GPU722610.160165.5738%100001700000.00151.7613%0.161666.1801%0.6063%
Difference+6+15.3277+3.0829%+490000+14830000+0.1000+3.3362%+15.4277+4.0743%+4.0743%

Known prime factors (1 factor, 70.2 bits, 0.00366139% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
191853713991669120796703263612270.245364644234664140
22 × 3 × 5 × 247717 × 24533657
2009-08-0224771724533657171.490.12360.1964

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-17T19:18:58alpertronManual testing5000001500000012---0.101--5.097%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2002-12-25T00:00:00ANONYMOUSv4_computers21258--0.020--
2022-03-09T05:13:25LordJuliusManual testing21260--0.080--
2009-06-02T03:29:00Architects Cubedi4l_1260261--0.080--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.779 GHz-days
Estimated T-Level:24.554
DigitsB1CurvesCompleteFacMiss
2011000255 / 1002.5507.709%
2550000255 / 2800.91140.158%

New Calculation Method

Total ECM effort:19.779 GHz-days
Estimated T-Level:24.554
DigitsB1CompleteFacMiss
201100010.5480.003%
25500000.97137.883%
302500000.06294.023%
3510000000.00399.711%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
500005000000241.667
50000660000021717.00
500006750000141.109


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-15T00:00:00ANONYMOUSv4_computers932BF001146560EB0.104


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T22:08:51Oliver KruseGTX-2
1399166912079670326361
A7A76A471300B6__no
2017-11-09T21:22:39kkmrkkblmbrbkc4.large
1399166912079670326361
A7A76A471300B6__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
104
105
106
104
105
106
107
108
TF factor-bounds graph:
267
261
260
258
250
260
270
280
290
2100
Last modified: 2022-03-09T05:13:25+00:00