A156288 Numbers n such that 4*n-5 is not a prime number.

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

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

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

Adjacent sequences: A156285 A156286 A156287 * A156289 A156290 A156291

Keyword

nonn,easy

Author

Vincenzo Librandi, Feb 07 2009

Status

approved