is 2 1882247 - 1
has 566613 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-L5EF7AA0665E5E25Fdouble-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.786468.6567%500000150000000.10155.0858%15.887970.2508%1.5941%
PrimeNet2570.010263.1579%90001600000.00143.0328%0.011664.2752%1.1173%
GPU722610.163265.5738%100001500000.00141.6918%0.164666.1562%0.5824%
Difference+6+15.6232+3.0829%+490000+14850000+0.1001+3.3940%+15.7233+4.0946%+4.0946%

Known prime factors (1 factor, 80.6 bits, 0.00428006% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
188224717838133930746214113627292580.561473852101524035212
22 × 112 × 31 × 809 × 39037970717
2009-12-2380939037970717177,174167.31312.48

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:39:37alpertronManual testing5000001500000012---0.101--5.086%


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


ECM factoring results:

Old Calculation Method

Total ECM effort:19.625 GHz-days
Estimated T-Level:24.554
DigitsB1CurvesCompleteFacMiss
2011000255 / 1002.5507.709%
2550000255 / 2800.91140.158%

New Calculation Method

Total ECM effort:19.625 GHz-days
Estimated T-Level:24.554
DigitsB1CompleteFacMiss
201100010.5130.003%
25500000.96838.001%
302500000.06194.044%
3510000000.00399.712%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
500005000000352.425
50000660000021316.65
50000675000070.553


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-01-02T00:00:00Ethan O'Connorv4_computers5EF7AA0665E5E25F0.102


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T14:20:23Oliver KruseGTX-3
1783813393074621411362729
A4CC58C6BFC9E4__no
2017-11-08T06:47:44kkmrkkblmbrbkc4.xlarge
1783813393074621411362729
A4CC58C6BFC9E4__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
1010
1011
TF factor-bounds graph:
267
258
250
260
270
280
290
2100
Last modified: 2021-10-28T13:39:17+00:00