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A153383 Numbers n such that 12*n+1 is not prime. 4
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 (list; graph; refs; listen; history; text; internal format)
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 A295837 A321972

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

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Last modified April 15 20:40 EDT 2021. Contains 342977 sequences. (Running on oeis4.)