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Search: id:A090693
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| A090693 |
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Numbers n such that n^2 - 2n + 2 is a prime. |
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+0
7
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| 2, 3, 5, 7, 11, 15, 17, 21, 25, 27, 37, 41, 55, 57, 67, 75, 85, 91, 95, 111, 117, 121, 125, 127, 131, 135, 147, 151, 157, 161, 171, 177, 181, 185, 205, 207, 211, 225, 231, 237, 241, 251, 257, 261, 265, 271, 281, 285, 301, 307, 315, 327, 341, 351, 385, 387, 397
(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) = A005574(n)+1.
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CROSSREFS
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A002496 gives primes, A062325 gives prime index. Cf. A001912.
A005574(n+1) + 1.
Adjacent sequences: A090690 A090691 A090692 this_sequence A090694 A090695 A090696
Sequence in context: A027341 A094252 A106532 this_sequence A049756 A026813 A008636
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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 19 2003
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EXTENSIONS
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Corrected and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Dec 28 2003
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