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Search: id:A089682
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| A089682 |
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Primes of the form 3n^2 - 1. |
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+0
2
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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; listen)
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OFFSET
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1,1
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COMMENT
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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]
Primes p such that 3*(p+1) is square [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 03 2009]
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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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CROSSREFS
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Sequence in context: A140305 A142346 A106980 this_sequence A050929 A019005 A112288
Adjacent sequences: A089679 A089680 A089681 this_sequence A089683 A089684 A089685
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KEYWORD
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easy,nonn
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AUTHOR
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Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Jan 05 2004
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EXTENSIONS
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More terms from Rick L. Shepherd (rshepherd2(AT)hotmail.com), May 18 2005
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