A186721 - OEIS

%I #11 Oct 30 2018 10:31:02

%S 3,7,13,37,73,277,373,577,727,853,1033,1063,1327,1423,1453,1567,1777,

%T 1987,2293,2677,2767,3037,3163,3307,3457,4273,4447,4993,5197,5557,

%U 6247,6673,7573,8353,8893,9067,9397,9463,9547,9613,10303,10903,12007,12973,13177,14083

%N Numbers n such that n, 4n + 1 and 6n + 1 are all prime.

%C Subsequence of A023212.

%t Join[{3},Select[Range[7, 20000, 6], PrimeQ[#] && PrimeQ[4# + 1] && PrimeQ[6# + 1] &]]

%Y Cf. A023212.

%K nonn

%O 1,1

%A _Zak Seidov_, Jan 21 2012