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Search: id:A089747
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| A089747 |
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Numbers n such that n^2 - 2n + 5 is prime. |
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+0
1
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| 2, 4, 6, 8, 14, 16, 18, 28, 34, 36, 38, 46, 48, 58, 66, 68, 74, 86, 88, 96, 98, 104, 116, 118, 126, 136, 138, 148, 156, 164, 167, 178, 184, 194, 204, 207, 216, 218, 234, 236, 244, 246, 254, 256, 266, 268, 276, 278, 288
(list; graph; listen)
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OFFSET
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1,1
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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) = A007591(n)+1.
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CROSSREFS
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Cf. A005473 gives primes, A007591.
Sequence in context: A086526 A086529 A054409 this_sequence A049015 A005250 A039597
Adjacent sequences: A089744 A089745 A089746 this_sequence A089748 A089749 A089750
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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), Jan 08 2004
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