A156287 Numbers k such that 4*k-5 is a prime number.

2, 3, 4, 6, 7, 9, 12, 13, 16, 18, 19, 21, 22, 27, 28, 33, 34, 36, 39, 42, 43, 46, 49, 51, 54, 57, 58, 61, 64, 67, 69, 72, 78, 79, 84, 88, 91, 93, 96, 97, 106, 109, 111, 112, 117, 118, 121, 123, 124, 126, 127, 132, 138, 142, 144, 148, 151, 153, 156, 159, 162, 163, 166

Offset

1,1

Comments

Two more than the associated A095278, one more than the associated A005099. - R. J. Mathar, Jan 05 2011

Links

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

Mathematica

Select[Range[600], PrimeQ[4 # - 5]&] (* Vincenzo Librandi, Feb 16 2013 *)

Prog

(Magma) [n: n in [1..400] | IsPrime(4*n - 5)]; // Vincenzo Librandi, Feb 16 2013

Crossrefs

Cf. A156288, A005099, A095278.

Sequence in context: A332555 A304206 A243498 * A162293 A233459 A145803

Adjacent sequences: A156284 A156285 A156286 * A156288 A156289 A156290

Keyword

nonn,easy

Author

Vincenzo Librandi, Feb 07 2009

Status

approved