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A153276
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Numbers n >= 0 such that 5*n+6 is not prime.
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1
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0, 2, 3, 4, 6, 8, 9, 10, 12, 14, 15, 16, 17, 18, 20, 21, 22, 23, 24, 26, 27, 28, 30, 31, 32, 33, 34, 36, 38, 39, 40, 42, 43, 44, 45, 46, 48, 50, 51, 52, 54, 56, 57, 58, 59, 60, 62, 63, 64, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 80, 81, 82, 84, 86, 87, 88, 89, 90
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OFFSET
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1,2
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COMMENTS
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The odd terms are the integer values of (4*h*k + 2*k + 2*h - 5)/5, where h and k are positive integers. - Vincenzo Librandi, Jan 17 2013
The corresponding composite numbers are 6, 16, 21, 26, 36, 46, 51, 56, 66, 76, 81, 86, 91, 96, 106, 111, 116, 121, ... - Michael B. Porter, Jan 17 2013
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 1..1000
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MATHEMATICA
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Select[Range[0, 200], !PrimeQ[5 # + 6]&] (* Vincenzo Librandi, Jan 12 2013 *)
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PROG
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(MAGMA) [n: n in [0..150] | not IsPrime(5*n + 6)]; // Vincenzo Librandi, Jan 12 2013
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CROSSREFS
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Cf. A081759.
Sequence in context: A321473 A125292 A101513 * A298866 A108408 A173905
Adjacent sequences: A153273 A153274 A153275 * A153277 A153278 A153279
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KEYWORD
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nonn,easy
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AUTHOR
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Vincenzo Librandi, Dec 22 2008
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EXTENSIONS
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Erroneous comment deleted by N. J. A. Sloane, Jun 23 2010
Corrected by Jon E. Schoenfield, Jun 24 2010
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STATUS
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approved
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