is 2 1839737 - 1
has 553817 decimal digits
takes 0.100 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L4547A654E66AC540double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26716.151268.6567%500000150000000.10155.0718%16.252770.2464%1.5897%
PrimeNet2570.010463.1579%80001500000.00122.8820%0.011764.2197%1.0618%
GPU722610.167065.5738%90001400000.00131.5963%0.168266.1233%0.5496%
Difference+6+15.9842+3.0829%+491000+14860000+0.1002+3.4755%+16.0844+4.1231%+4.1231%

Known prime factors (1 factor, 61.7 bits, 0.00335545% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
183973738283789030555978891961.7311040469073312
25 × 172 × 112507469
2009-07-192891125074690.18840.48220.9006

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-18T00:38:11alpertronManual testing5000001500000012---0.101--5.072%


Trial Factoring results:
 BitsFactorGHz-Daysworth
dateuseridcompidfromtofactorbits*digitsspentsaved
2003-01-16T00:00:00ANONYMOUSv4_computers21258--0.021--


ECM factoring results:

Old Calculation Method

Total ECM effort:19.559 GHz-days
Estimated T-Level:24.536
DigitsB1CurvesCompleteFacMiss
2011000254 / 1002.5407.786%
2550000254 / 2800.90740.302%

New Calculation Method

Total ECM effort:19.559 GHz-days
Estimated T-Level:24.536
DigitsB1CompleteFacMiss
201100010.4970.003%
25500000.96638.063%
302500000.06194.053%
3510000000.00399.712%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
500005000000271.866
50000660000022017.14
50000675000070.551


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1998-12-27T00:00:00ANONYMOUSv4_computers4547A654E66AC5400.100


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T03:48:03Oliver KruseGTX-1
3828378903055597889
9AE88BE02818BA__no
2017-11-06T17:26:27kkmrkkblmbrbkold
3828378903055597889
9AE88BE02818BA__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
101
102
103
104
105
106
101
102
103
104
105
106
107
108
109
TF factor-bounds graph:
267
258
250
260
270
280
290
2100
Last modified: 2021-06-04T15:56:34+00:00