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%I #14 Sep 08 2022 08:45:41
%S 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,
%T 57,58,61,64,67,69,72,78,79,84,88,91,93,96,97,106,109,111,112,117,118,
%U 121,123,124,126,127,132,138,142,144,148,151,153,156,159,162,163,166
%N Numbers k such that 4*k-5 is a prime number.
%C Two more than the associated A095278, one more than the associated A005099. - _R. J. Mathar_, Jan 05 2011
%H Vincenzo Librandi, <a href="/A156287/b156287.txt">Table of n, a(n) for n = 1..1000</a>
%t Select[Range[600], PrimeQ[4 # - 5]&] (* _Vincenzo Librandi_, Feb 16 2013 *)
%o (Magma) [n: n in [1..400] | IsPrime(4*n - 5)]; // _Vincenzo Librandi_, Feb 16 2013
%Y Cf. A156288, A005099, A095278.
%K nonn,easy
%O 1,1
%A _Vincenzo Librandi_, Feb 07 2009
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