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A087370
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3n-1 is a prime.
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4
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1, 2, 4, 6, 8, 10, 14, 16, 18, 20, 24, 28, 30, 34, 36, 38, 44, 46, 50, 56, 58, 60, 64, 66, 76, 78, 80, 84, 86, 88, 90, 94, 98, 104, 106, 116, 118, 120, 128, 130, 134, 140, 144, 148, 150, 154, 156, 160, 164, 168, 170, 174, 186, 188, 190, 196, 198, 200, 206, 214, 216
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| 3*n-1 is the Eisenstein's prime. [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 08 2010]
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REFERENCES
| M. Cerasoli, F. Eugeni and M. Protasi, Elementi di Matematica Discreta, Bologna 1988
Emanuele Munarini and Norma Zagaglia Salvi, Matematica Discreta, UTET, CittaStudiEdizioni, Milano 1997
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FORMULA
| a(n)= A024893(n)+1 = A088879(n)+2.
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MATHEMATICA
| lst={}; Do[p=3*n-1; If[PrimeQ[p], AppendTo[lst, n]], {n, 0, 10^3}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Sep 10 2008]
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CROSSREFS
| A003627 gives primes, A091177 gives prime index.
Sequence in context: A121832 A006586 A022292 * A138929 A180081 A191146
Adjacent sequences: A087367 A087368 A087369 * A087371 A087372 A087373
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KEYWORD
| easy,nonn
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AUTHOR
| Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Oct 21 2003
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EXTENSIONS
| Corrected and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Oct 22 2003
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