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Search: id:A090697
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| A090697 |
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Numbers n such that n^2/2 - 1 is a prime. |
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+0
5
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| 4, 6, 8, 12, 14, 16, 20, 22, 26, 30, 34, 36, 42, 44, 48, 50, 56, 68, 72, 76, 78, 82, 84, 86, 90, 92, 98, 100, 104, 112, 118, 124, 126, 128, 138, 146, 152, 160, 162, 170, 174, 182, 184, 190, 196, 204, 216, 218, 224, 226, 230, 236, 250, 252, 254, 264, 268, 274, 280
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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A066436 gives resulting primes p such that 2p+2 is square. - Chandler
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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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FORMULA
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a(n) = 2*A066049(n) = A110558(n)/2. - Chandler
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CROSSREFS
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Cf. A066049, A066436, A091176, A110558.
Sequence in context: A110606 A117247 A047407 this_sequence A107303 A028876 A053579
Adjacent sequences: A090694 A090695 A090696 this_sequence A090698 A090699 A090700
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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), Dec 20 2003
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EXTENSIONS
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Corrected and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Dec 25 2003
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