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A089681
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Numbers n such that 3n^2 - 1 is prime.
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2
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1, 2, 4, 6, 8, 12, 14, 18, 22, 26, 28, 30, 34, 40, 44, 48, 50, 52, 54, 58, 60, 70, 72, 74, 76, 78, 92, 96, 110, 118, 122, 136, 138, 144, 150, 154, 158, 164, 176, 182, 186, 188, 204, 210, 214, 216, 230, 232, 234, 236, 242, 248, 260, 268, 272, 274, 280, 298, 304, 308
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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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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LINKS
| Harvey P. Dale, Table of n, a(n) for n = 1..1000
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MATHEMATICA
| Select[Range[500], PrimeQ[3#^2-1]&] (* From Harvey P. Dale, Oct 09 2011 *)
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CROSSREFS
| Sequence in context: A043569 A010063 A089623 * A057220 A082742 A100195
Adjacent sequences: A089678 A089679 A089680 * A089682 A089683 A089684
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KEYWORD
| easy,nonn
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AUTHOR
| Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Jan 05 2004
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EXTENSIONS
| More terms from Rick L. Shepherd (rshepherd2(AT)hotmail.com), May 18 2005
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