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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 (list; graph; refs; listen; history; text; internal format)
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: A180748 A121901 A024707 * A270535 A287110 A194425

Adjacent sequences:  A156285 A156286 A156287 * A156289 A156290 A156291

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Feb 07 2009

STATUS

approved

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Last modified July 18 15:44 EDT 2019. Contains 325144 sequences. (Running on oeis4.)