%I
%S 2,7,11,17,23,29,31,37,43,73,101,107,127,163,179,197,239,277,281,317,
%T 331,359,367,421,457,463,487,541,569,613,617,619,661,709,739,773,787,
%U 809,823,877,941,947,953,991,1019,1031,1033,1039,1051,1087,1163,1187
%N Numbers k with the property that k and k^2 + 3k+9 are primes.
%C Or, primes in A175282.
%t Select[Prime[Range[400]],PrimeQ[ #^2+3*#+9]&]
%o (MAGMA) [ n: n in [0..1250]  IsPrime(n) and IsPrime(n^2+3*n+9)] // _Vincenzo Librandi_, Jan 30 2011
%Y Cf. A005471, A175281, A175282.
%K nonn
%O 1,1
%A _Zak Seidov_, Mar 21 2010
