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Search: id:A089238
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| A089238 |
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Numbers n such that 3*n^2/2 - 1 is a prime. |
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+0
1
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| 2, 4, 6, 10, 14, 16, 20, 24, 26, 34, 40, 44, 54, 56, 60, 64, 70, 76, 86, 90, 104, 110, 116, 120, 124, 126, 130, 136, 140, 146, 150, 154, 164, 166, 174, 186, 194, 200, 204, 230, 240, 244, 260, 264, 286, 300, 306, 336, 346, 354, 374, 386, 394, 400, 414, 416, 420
(list; graph; listen)
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OFFSET
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1,1
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REFERENCES
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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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PROGRAM
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(PARI) forstep(n=2, 1000, 2, if(isprime(3*n^2/2-1), print1(n, ", "))) - Rick L. Shepherd (rshepherd2(AT)hotmail.com), May 06 2008
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CROSSREFS
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Cf. A090686.
Sequence in context: A075574 A104692 A066755 this_sequence A005574 A109807 A125964
Adjacent sequences: A089235 A089236 A089237 this_sequence A089239 A089240 A089241
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KEYWORD
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nonn
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AUTHOR
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Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Dec 22 2003
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EXTENSIONS
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Corrected and extended by Rick L. Shepherd (rshepherd2(AT)hotmail.com), May 06 2008
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