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A228373 Numbers n such that 27*n + 1 is not prime. 1
0, 1, 2, 3, 5, 7, 8, 9, 11, 12, 13, 15, 17, 19, 21, 22, 23, 24, 25, 26, 27, 29, 31, 32, 33, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 49, 50, 51, 52, 53, 55, 56, 57, 59, 61, 62, 63, 64, 65, 67, 68, 69, 70, 71, 72, 73, 75, 77, 78, 79, 81, 82, 83, 85, 86, 87, 89, 90 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
COMMENTS
Complement of A224467.
LINKS
MATHEMATICA
Select[Range[0, 120], ! PrimeQ[27 # + 1]&]
PROG
(Magma) [n: n in [0..120] | not IsPrime(27*n + 1)];
CROSSREFS
Cf. A224467.
Sequence in context: A053661 A171944 A134623 * A156271 A186513 A350799
KEYWORD
nonn,less,easy
AUTHOR
Vincenzo Librandi, Aug 21 2013
STATUS
approved

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Last modified March 18 22:56 EDT 2024. Contains 370952 sequences. (Running on oeis4.)