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A156287 Numbers k such that 4*k-5 is a prime number. 3
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified December 3 09:50 EST 2022. Contains 358517 sequences. (Running on oeis4.)