%I
%S 4,6,10,14,16,18,20,28,30,34,48,54,58,60,66,74,76,80,84,88,94,96,98,
%T 108,110,114,118,128,130,136,138,144,146,150,154,166,170,180,184,186,
%U 188,198,206,214,230,236,238,240,258,264,268,278,280,284,286,296,300
%N Numbers n such that 27*n+1 is prime.
%H K. D. Bajpai, <a href="/A224467/b224467.txt">Table of n, a(n) for n = 1..5736</a>
%e 27*6 + 1 = 163 which is prime. Hence 6 is in the sequence.
%p isA224467 := proc(n)
%p isprime(27*n+1) ;
%p end proc:
%p for n from 1 to 300 do
%p if isA224467(n) then
%p printf("%d,",n) ;
%p end if;
%p end do: # _R. J. Mathar_, Jul 20 2013
%t Select[Range[300],PrimeQ[27#+1]&] (* _Harvey P. Dale_, Apr 14 2017 *)
%o (PARI) is(n)=isprime(27*n+1) \\ _Charles R Greathouse IV_, Jun 06 2017
%Y Cf. A005123, A024906.
%K nonn,easy
%O 1,1
%A _K. D. Bajpai_, Jul 20 2013
