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Search: id:A154619
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| A154619 |
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Primes of the form (4n^2+4n-5)/5. |
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1
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| 23, 71, 167, 191, 479, 743, 1583, 2039, 2927, 3863, 5711, 6551, 7919, 9767, 10487, 11423, 15791, 16703, 18119, 21647, 21911, 24359, 27527, 32159, 35111, 35447, 38543, 43991, 45887, 46271, 52223, 54287, 55967, 60719, 67511, 69383, 76631
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OFFSET
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1,1
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COMMENT
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The n that generate integers of the form (4n^2+4n-5)/5 are in A047208. The primes are generated by the subset n = 5, 9, 14, 15, 24, 30, ... of these. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 25 2009
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MAPLE
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a := proc (n) if type((4/5)*n^2+(4/5)*n-1, integer) = true and isprime((4/5)*n^2+(4/5)*n-1) = true then (4/5)*n^2+(4/5)*n-1 else end if end proc: seq(a(n), n = 1 .. 340); [From Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 21 2009]
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CROSSREFS
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Cf. A028880
Sequence in context: A042040 A073035 A086104 this_sequence A142405 A139962 A139878
Adjacent sequences: A154616 A154617 A154618 this_sequence A154620 A154621 A154622
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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 16 2009
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EXTENSIONS
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Definition corrected and more terms from R. J. Mathar and Omar E. Pol, Jan 24 2009
Extended by Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 21 2009
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