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A005541
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Numbers n such that 8*3^n - 1 is prime.
(Formerly M1200)
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9
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1, 2, 4, 10, 17, 50, 170, 184, 194, 209, 641, 1298, 4034, 5956, 7154, 9970
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
H. C. Williams and C. R. Zarnke, Some prime numbers of the forms 2*3^n+1 and 2*3^n-1, Math. Comp., 26 (1972), 995-998.
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MATHEMATICA
| lst={}; Do[If[PrimeQ[8*3^n-1], AppendTo[lst, n]], {n, 13^3}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Sep 08 2008]
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CROSSREFS
| Cf. A003307, A002235, A046865, A079906, A046866, A001771, A056725, A046867, A079907.
Sequence in context: A152231 A034455 A057491 * A045955 A093695 A189892
Adjacent sequences: A005538 A005539 A005540 * A005542 A005543 A005544
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KEYWORD
| nonn,hard
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| More terms from Douglas Burke (dburke(AT)nevada.edu) (no other terms below 12000).
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