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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
OFFSET
1,1
COMMENTS
Two more than the associated A095278, one more than the associated A005099. - R. J. Mathar, Jan 05 2011
LINKS
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
KEYWORD
nonn,easy
AUTHOR
Vincenzo Librandi, Feb 07 2009
STATUS
approved