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A156288
Numbers n such that 4*n-5 is not a prime number.
3
5, 8, 10, 11, 14, 15, 17, 20, 23, 24, 25, 26, 29, 30, 31, 32, 35, 37, 38, 40, 41, 44, 45, 47, 48, 50, 52, 53, 55, 56, 59, 60, 62, 63, 65, 66, 68, 70, 71, 73, 74, 75, 76, 77, 80, 81, 82, 83, 85, 86, 87, 89, 90, 92, 94, 95, 98, 99, 100, 101, 102, 103, 104, 105, 107, 108, 110
OFFSET
1,1
LINKS
MATHEMATICA
Select[Range[2, 150], !PrimeQ[4 # - 5]&] (* Vincenzo Librandi, Apr 06 2013 *)
PROG
(Magma) [n: n in [2..150] | not IsPrime(4*n-5)]; // Vincenzo Librandi, Apr 06 2013
CROSSREFS
Cf. A156287.
Sequence in context: A350377 A121901 A024707 * A270535 A287110 A194425
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Feb 07 2009
STATUS
approved