The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A153219 Numbers n such that 6*n + 7 is not prime. 3
 3, 7, 8, 13, 14, 18, 19, 21, 23, 27, 28, 30, 33, 35, 38, 40, 41, 42, 43, 47, 48, 49, 52, 53, 56, 58, 59, 63, 64, 66, 68, 70, 73, 74, 77, 78, 79, 81, 83, 84, 85, 87, 88, 91, 92, 93 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS One less than the associated entry in A046954. - R. J. Mathar, Jan 05 2011 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 EXAMPLE Distribution of the terms in the following triangular array: *; *,3; *,*,7; *,*,*,*; *,8,*,*,19; *,*,14,*,*,27; *,*, *,*,*, *,*; *,13,*,*,30,*,*,47; *,*,21,*,*,40,*,*,59; *,*,*, *,*, *,*,*, *,*; *,18,*,*,41,*,*,64,*,*,87; *,*,28,*,*,53,*,*,78,*,*,103; etc. where * marks the non-integer values of (2*h*K + k + h - 3)/3 with h >= k >= 1. - Vincenzo Librandi, Jan 15 2013 MATHEMATICA Select[Range[0, 200], !PrimeQ[6 # + 7] &] (* Vincenzo Librandi, Jan 12 2013 *) PROG (MAGMA) [n: n in [0..110] | not IsPrime(6*n+7)]; // Vincenzo Librandi, Jan 12 2013 CROSSREFS Cf. A153218. Sequence in context: A031425 A063657 A108575 * A264720 A215034 A050014 Adjacent sequences:  A153216 A153217 A153218 * A153220 A153221 A153222 KEYWORD nonn,easy AUTHOR Vincenzo Librandi, Dec 21 2008 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified June 19 14:08 EDT 2021. Contains 345140 sequences. (Running on oeis4.)