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Search: id:A154632
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| A154632 |
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Numbers p (prime) such that [(4*p^2-8*p-9)/3] is a prime. |
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| 5, 17, 23, 41, 59, 71, 89, 149, 197, 233, 239, 347, 359, 401, 419, 449, 563, 683, 761, 773, 827, 887, 971, 977, 1049, 1061, 1097, 1193, 1277, 1373, 1439, 1553, 1571, 1787, 1871, 1877, 1931, 2069, 2267, 2273, 2381, 2417, 2447, 2687, 2699, 2777, 2843, 2957
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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For p= 5, [(4*p^2-8*p-9)/3]=17; p=149, [(4*p^2-8*p-9)/3]=29201
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MAPLE
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a := proc (n) if isprime(n) = true and type((4/3)*n^2-(8/3)*n-3, integer) = true and isprime((4/3)*n^2-(8/3)*n-3) = true then n else end if end proc: seq(a(n), n = 2 .. 4000); [From Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 20 2009]
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CROSSREFS
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Cf. A154616
Sequence in context: A105884 A019410 A133423 this_sequence A141275 A145043 A097434
Adjacent sequences: A154629 A154630 A154631 this_sequence A154633 A154634 A154635
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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 18 2009
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EXTENSIONS
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Extended by Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 20 2009
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