A153282 - OEIS

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A153282

Numbers k such that 3*k + 4 is not prime.

0, 2, 4, 6, 7, 8, 10, 12, 14, 15, 16, 17, 18, 20, 22, 24, 26, 27, 28, 29, 30, 32, 34, 36, 37, 38, 39, 40, 42, 43, 44, 46, 47, 48, 50, 52, 54, 55, 56, 57, 58, 60, 61, 62, 64, 66, 67, 68, 70, 71, 72, 74, 76, 77, 78, 80, 81, 82, 83, 84, 85, 86, 87, 88, 90, 92, 94, 95, 96, 97, 98, 99, 100

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Complement of A034936. - Omar E. Pol, Jan 18 2009

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..1000

EXAMPLE

Distribution of the odd terms in the following triangular array:

*,7;

*,*,15;

*,*,*,*;

*,17.*,*,39;

*,*,29,*,*,55;

*,*, *,*,*,*, *;

*,27,*,*,61,*,*,95;

*,*,43,*,*,81,*,*,119;

*,*, *,*,*,*, *,*, *, *;

*,37,*,*,83,*,*,129,*,*,175;

*,*,57,*,*,107,*,*,157,*,*,207; etc.

where * marks the non-integer values of (4*h*k + 2*k + 2*h - 3)/3 with h >= k >= 1. - Vincenzo Librandi, Jan 17 2013

MATHEMATICA

Select[Range[0, 200], !PrimeQ[3*# + 4]&] (* Vincenzo Librandi, Jan 12 2013 *)

PROG

(Magma) [n: n in [0..150] | not IsPrime(3*n + 4)]; // Vincenzo Librandi, Jan 12 2013

CROSSREFS

Cf. A034936.

Sequence in context: A047237 A285520 A039028 * A014661 A047511 A066507

Adjacent sequences: A153279 A153280 A153281 * A153283 A153284 A153285

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Dec 23 2008

EXTENSIONS

Edited (and terms confirmed) by N. J. A. Sloane, Jan 18 2009

STATUS

approved