A153383 Numbers n such that 12*n+1 is not prime.

0, 2, 4, 7, 10, 11, 12, 14, 17, 18, 21, 22, 24, 25, 27, 30, 32, 37, 39, 40, 41, 42, 43, 44, 46, 47, 49, 52, 53, 54, 57, 58, 60, 62, 65, 66, 67, 68, 70, 72, 74, 75, 76, 77, 79, 80, 81, 82, 87, 88, 90, 92, 95, 97, 98, 99, 102, 105, 106, 107, 109, 111, 112, 113, 114

Offset

1,2

Comments

Complement of A110801 (12*n+1 is prime). [Klaus Brockhaus, Jan 02 2009]

Links

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

Example

Triangle begins:
*;
*,2;
*,*,4;
*,*,*,*;
*,*,*,*,10;
*,*,*,*,*,14;
*,*,*,*,*,*,*:
*,7,*,*,*,*,*,24;
*,*,11,*,*,*,*,*,30;
where * marks the non-integer values of (2*h*k + k + h)/6 with h >= k >= 1.- Vincenzo Librandi, Jan 13 2013

Mathematica

Select[Range[0, 200], !PrimeQ[12*# + 1] &] (* Vincenzo Librandi, Jan 13 2013 *)

Prog

(Magma) [ n: n in [0..120] | not IsPrime(12*n+1) ]; // Klaus Brockhaus, Jan 02 2009

Crossrefs

Cf. A110801.

Sequence in context: A325745 A167206 A053223 * A278997 A342782 A295837

Adjacent sequences: A153380 A153381 A153382 * A153384 A153385 A153386

Keyword

nonn,easy

Author

Vincenzo Librandi, Dec 25 2008

Extensions

More terms from Klaus Brockhaus, Jan 02 2009

0 added by Arkadiusz Wesolowski, Aug 03 2011

Status

approved