

A153381


Numbers n such that 11*n+5 is not prime.


1



1, 2, 3, 4, 5, 7, 8, 9, 10, 11, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23, 25, 26, 27, 29, 30, 31, 32, 33, 35, 37, 38, 39, 40, 41, 43, 44, 45, 46, 47, 48, 49, 50, 51, 53, 55, 56, 57, 59, 60, 61, 62, 63, 65, 66, 67, 68, 69, 70, 71, 73, 74, 75, 76, 77, 79, 80, 81, 83, 85, 86, 87, 88
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OFFSET

1,2


LINKS

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


EXAMPLE

Distribution of the even terms in the following triangular array:
*;
*,*;
*,*,4;
2,*,*,*;
*,*,*,*,*;
*,*,*,*,*,*;
*,*,*,*,*,*,20;
*,*,*,*,*,*,*,*,;
*,*,*,*,*,22,*,*,*;
*,*,*,*,*,*,*,32,*,*;
*,10,*,*,*,*,*,*,*,*,*;
*,*,*,20,*,*,*,*,*,*,*,*;
*,*,*,*,*,*,*,*,*,*,56,*,*:
*,*,18,*,*,*,*,*,*,*,*,*,*,76;
8,*,*,*,*,*,*,*,*,*,*,70,*,*,*; etc.
where * marks the noninteger values of (4*h*k + 2*k + 2*h  4)/11 with h >= k >= 1.  Vincenzo Librandi, Jan 17 2013


MATHEMATICA

Select[Range[0, 200], !PrimeQ[11 # + 5] &] (* Vincenzo Librandi, Jan 13 2013 *)


PROG

(Magma) [n: n in [0..150]  not IsPrime(11*n+5)]; // Vincenzo Librandi, Jan 13 2013


CROSSREFS

Cf. A108233.
Sequence in context: A098901 A098767 A333559 * A307750 A356734 A319630
Adjacent sequences: A153378 A153379 A153380 * A153382 A153383 A153384


KEYWORD

nonn,easy


AUTHOR

Vincenzo Librandi, Dec 25 2008


EXTENSIONS

Erroneous comment deleted by N. J. A. Sloane, Jun 23 2010


STATUS

approved



