is 2 1887169 - 1
has 568095 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-LAD5EF32242D72145double-checked
PRP-unknown--unknown-

 Trial FactoringP-1 FactoringCombined
LimitGHz-daysProbabilityB1B2GHz-daysProbabilityGHz-daysProbabilityProb over default TF
Actual26715.745268.6567%500000150000000.10155.0874%15.846770.2513%1.5946%
PrimeNet2570.010263.1579%90001600000.00143.0342%0.011564.2758%1.1179%
GPU722610.162865.5738%100001500000.00141.6927%0.164266.1565%0.5827%
Difference+6+15.5825+3.0829%+490000+14850000+0.1001+3.3947%+15.6825+4.0948%+4.0948%

Known prime factors (1 factor, 74.5 bits, 0.00394806% known):
Remaining cofactor is not a probable-prime

P-1GHz-days
exponentfactordigitsbits*kdate foundmin B1min B2min. TFmin. P-1normal P-1
1887169268346701768370389426972374.5077109768700322292
22 × 29 × 53 × 1156436028029
2008-10-315311564360280293,515.84,956.29,256.8

P-1 results:
 GHz-DaysworthFactor
probability
dateuseridcompidb1b2estagefactordigitsbits*spentsaved
2016-03-16T12:40:19alpertronManual 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:19.025 GHz-days
Estimated T-Level:24.411
DigitsB1CurvesCompleteFacMiss
2011000247 / 1002.4708.354%
2550000247 / 2800.88241.324%

New Calculation Method

Total ECM effort:19.025 GHz-days
Estimated T-Level:24.411
DigitsB1CompleteFacMiss
201100010.1850.004%
25500000.93739.171%
302500000.05994.225%
3510000000.00399.721%


ECM Summary

B1B2factorcurvesGHz-days
10.00000e+0
50000470000070.474
500005000000191.317
500006035649141.051
50000660000020716.18


Lucas-Lehmer results:
dateuseridcompidres64spent (GHz-days)
1999-03-15T00:00:00ANONYMOUSv4_computersAD5EF32242D721450.102


PRP results:
dateuseridcompidcofactorsres64PRP
2017-10-04T15:20:30Oliver KruseGTX-1
26834670176837038942697
D9EBCFEEF25509__no
2017-11-08T13:07:07kkmrkkblmbrbkc4.xlarge
26834670176837038942697
D9EBCFEEF25509__no


P-1 factor-bounds graph:
B1 = 500000, B2 = 15000000 (P-1 stage 2)
B1 = 500000 (P-1 stage 1)
100
101
102
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1010
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TF factor-bounds graph:
267
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2100
Last modified: 2021-11-04T11:47:41+00:00