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A153383
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Numbers n such that 12*n+1 is not prime.
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4
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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
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OFFSET
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1,2
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COMMENTS
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Complement of A110801 (12*n+1 is prime). [Klaus Brockhaus, Jan 02 2009]
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LINKS
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Vincenzo Librandi, Table of n, a(n) for n = 1..1000
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EXAMPLE
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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
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MATHEMATICA
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Select[Range[0, 200], !PrimeQ[12*# + 1] &] (* Vincenzo Librandi, Jan 13 2013 *)
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PROG
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(MAGMA) [ n: n in [0..120] | not IsPrime(12*n+1) ]; // Klaus Brockhaus, Jan 02 2009
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CROSSREFS
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Cf. A110801.
Sequence in context: A325745 A167206 A053223 * A278997 A342782 A295837
Adjacent sequences: A153380 A153381 A153382 * A153384 A153385 A153386
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KEYWORD
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nonn,easy
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AUTHOR
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Vincenzo Librandi, Dec 25 2008
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EXTENSIONS
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More terms from Klaus Brockhaus, Jan 02 2009
0 added by Arkadiusz Wesolowski, Aug 03 2011
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STATUS
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approved
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