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A089682
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Primes of the form 3n^2 - 1.
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1
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2, 11, 47, 107, 191, 431, 587, 971, 1451, 2027, 2351, 2699, 3467, 4799, 5807, 6911, 7499, 8111, 8747, 10091, 10799, 14699, 15551, 16427, 17327, 18251, 25391, 27647, 36299, 41771, 44651, 55487, 57131, 62207, 67499, 71147, 74891, 80687, 92927
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| 431 and 27647 also have the form 2n^3-1 (431=3x12^2-1=2x6^3-1 and 27647=3x96^2-1=2x24^3-1). [From Howard Berman (howard_berman(AT)hotmail.com), May 09 2009]
Of course primes p such that 3*(p+1) is a square [From V. Librandi, Nov 18 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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CROSSREFS
| Sequence in context: A140305 A142346 A106980 * A198693 A178710 A050929
Adjacent sequences: A089679 A089680 A089681 * A089683 A089684 A089685
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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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