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Numbers of the form 11 + x^2 + x or 11 + 2*x^2.
5

%I #7 May 06 2013 11:51:03

%S 11,13,17,19,23,29,31,41,43,53,61,67,83,101,109,121,139,143,167,173,

%T 193,211,221,251,253,283,299,317,349,353,391,403,431,461,473,517,523,

%U 563,589,611,659,661,713,733,767,811,823,881,893,941,979,1003,1067

%N Numbers of the form 11 + x^2 + x or 11 + 2*x^2.

%t Union[Flatten[Table[{11+x^2+x,11+2x^2},{x,0,40}]]] (* _Harvey P. Dale_, May 06 2013 *)

%K nonn,easy

%O 1,1

%A Stuart M. Ellerstein (ellerstein(AT)aol.com), Feb 08 2000

%E Corrected and extended by _James A. Sellers_, Feb 10 2000