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A055494
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Numbers n such that n^2 - n + 1 is prime.
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3
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2, 3, 4, 6, 7, 9, 13, 15, 16, 18, 21, 22, 25, 28, 34, 39, 42, 51, 55, 58, 60, 63, 67, 70, 72, 76, 78, 79, 81, 90, 91, 100, 102, 106, 111, 112, 118, 120, 132, 139, 142, 144, 148, 151, 154, 156, 162, 163, 165, 168, 169, 174, 177, 189, 190, 193, 195, 204, 207, 210, 216
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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REFERENCES
| M. Cerasoli, F. Eugeni and M. Protasi, Elementi di Matematica Discreta, Bologna 1988
D. E. Knuth, "The Art of Computer Programming," Addison-Wesley, Reading, MA, Volume II, page 378.
Emanuele Munarini and Norma Zagaglia Salvi, Matematica Discreta,UTET, CittaStudiEdizioni, Milano 1997
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CROSSREFS
| Equals A002384(n)+1.
A002383 gives the primes.
Sequence in context: A117307 A161890 A089388 * A165773 A064414 A002475
Adjacent sequences: A055491 A055492 A055493 * A055495 A055496 A055497
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KEYWORD
| nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Jul 05 2000
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EXTENSIONS
| More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Sep 15 2005
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