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Search: id:A154432
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| A154432 |
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Numbers n such that 5n^2-n+1 is prime. |
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+0
2
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| 1, 2, 3, 7, 8, 9, 10, 12, 14, 17, 19, 22, 24, 29, 33, 35, 42, 43, 50, 52, 57, 58, 65, 68, 72, 73, 75, 77, 94, 99, 105, 107, 117, 119, 120, 124, 129, 138, 140, 143, 155, 162, 178, 184, 187, 189, 190, 194, 199, 204, 208, 210, 219, 220, 229, 245, 248, 250, 252, 254, 255
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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The associated primes are p=5 for n=1, p=19 for n=2, p=43 for n=3, p=239 for n=7.
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MAPLE
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for n from 1 to 3000 do p := 5*n^2-n+1 ; if isprime(p) then printf("%d, ", n) ; fi; od: [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 12 2009]
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CROSSREFS
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Cf. A154431
Sequence in context: A089008 A047534 A118374 this_sequence A047361 A037461 A007607
Adjacent sequences: A154429 A154430 A154431 this_sequence A154433 A154434 A154435
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KEYWORD
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nonn
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AUTHOR
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Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Jan 09 2009
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EXTENSIONS
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Removed 114. Extended - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 12 2009
Misleading formula removed by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 24 2009
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