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Search: id:A089593
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| A089593 |
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Numbers n such that n^2 + 2n + 2 is prime. |
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+0
1
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| 0, 1, 3, 5, 9, 13, 15, 19, 23, 25, 35, 39, 53, 55, 65, 73, 83, 89, 109, 115, 119, 123, 125, 129, 133, 145, 149, 155, 159, 169, 175, 179, 183, 203, 205, 209, 223, 229, 235, 239, 249, 255, 259, 263, 269, 279, 283, 299, 305, 313, 325, 339, 349
(list; graph; listen)
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OFFSET
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1,3
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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) = A005574(n)-1 = A090693(n)-2.
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CROSSREFS
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Cf. A002496 gives the primes, A005574, A090693.
Sequence in context: A059093 A084593 A102968 this_sequence A086748 A018533 A076052
Adjacent sequences: A089590 A089591 A089592 this_sequence A089594 A089595 A089596
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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 30 2003
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