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A089623
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Numbers n such that n^2 + 2n - 1 is prime.
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0
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1, 2, 4, 6, 8, 12, 14, 18, 20, 26, 28, 32, 34, 36, 42, 46, 48, 54, 60, 62, 68, 70, 74, 76, 88, 92, 102, 106, 116, 118, 120, 126, 130, 134, 138, 144, 154, 160, 168, 172, 176, 182, 190, 204, 210, 216, 222, 230, 232, 236, 238, 246, 252, 256, 258, 264, 266, 272
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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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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FORMULA
| a(n) = 2*A088572(n).
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PROG
| (MAGMA) [n: n in [0..400] | IsPrime(n^2+2*n-1)] [From V.Librandi, Dec 17 2010]
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CROSSREFS
| Cf. A088572.
Sequence in context: A043765 A043569 A010063 * A089681 A057220 A082742
Adjacent sequences: A089620 A089621 A089622 * A089624 A089625 A089626
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KEYWORD
| nonn
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AUTHOR
| Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Dec 31 2003
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EXTENSIONS
| Corrected (1 prepended and 96 replaced with 92) by Vincenzo Librandi, Dec 17 2010
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