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 A153276 Numbers n >= 0 such that 5*n+6 is not prime. 1
 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 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS 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 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 MATHEMATICA Select[Range[0, 200], !PrimeQ[5 # + 6]&] (* Vincenzo Librandi, Jan 12 2013 *) PROG (MAGMA) [n: n in [0..150] | not IsPrime(5*n + 6)]; // Vincenzo Librandi, Jan 12 2013 CROSSREFS Cf. A081759. Sequence in context: A321473 A125292 A101513 * A298866 A108408 A173905 Adjacent sequences:  A153273 A153274 A153275 * A153277 A153278 A153279 KEYWORD nonn,easy AUTHOR Vincenzo Librandi, Dec 22 2008 EXTENSIONS Erroneous comment deleted by N. J. A. Sloane, Jun 23 2010 Corrected by Jon E. Schoenfield, Jun 24 2010 STATUS approved

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Last modified April 16 17:01 EDT 2021. Contains 343050 sequences. (Running on oeis4.)