is 2 1886449 - 1
has 567878 decimal digits
takes 0.102 GHz-days to do one PRP test
Last-known PrimeNet details:
Exponent is not assigned to anyone
0 primality tests remaining
ResidueStatus
L-L40162CD72F3786F5double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.751268.6567%500000150000000.10155.0872%15.852770.2512%1.5945%
PrimeNet2570.010263.1579%90001600000.00143.0340%0.011564.2757%1.1178%
GPU722610.162865.5738%100001500000.00141.6926%0.164266.1565%0.5827%
Difference+6+15.5884+3.0829%+490000+14850000+0.1001+3.3946%+15.6885+4.0947%+4.0947%

Known prime factors (1 factor, 63.7 bits, 0.00337748% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1886449151348623237104646312063.7154011468723435
3 × 5 × 31 × 71 × 121504429
2009-07-25711215044291.33600.52070.9726

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:40:13alpertronManual testing5000001500000012---0.101--5.087%


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


ECM factoring results:

Old Calculation Method

Total ECM effort:19.718 GHz-days
Estimated T-Level:24.571
DigitsB1CurvesCompleteFacMiss
2011000256 / 1002.5607.631%
2550000256 / 2800.91440.015%

New Calculation Method

Total ECM effort:19.718 GHz-days
Estimated T-Level:24.571
DigitsB1CompleteFacMiss
201100010.5580.003%
25500000.97237.845%
302500000.06294.019%
3510000000.00399.711%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
500005000000342.356
50000660000021516.81
50000673563270.553


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-02T00:00:00ANONYMOUSv4_computers40162CD72F3786F50.102


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T15:15:18Oliver KruseGTX-0
15134862323710464631
4F50998C432A53__no
2017-11-08T11:30:58kkmrkkblmbrbkc4.xlarge
15134862323710464631
4F50998C432A53__no


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
TF factor-bounds graph:
267
258
250
260
270
280
290
2100
Last modified: 2021-10-28T13:39:44+00:00