This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A052293 #8 Jul 02 2025 16:01:58
%S A052293 11,13,17,19,23,29,31,41,43,53,61,67,83,101,109,121,139,143,167,173,
%T A052293 193,211,221,251,253,283,299,317,349,353,391,403,431,461,473,517,523,
%U A052293 563,589,611,659,661,713,733,767,811,823,881,893,941,979,1003,1067
%N A052293 Numbers of the form 11 + x^2 + x or 11 + 2*x^2.
%t A052293 Union[Flatten[Table[{11+x^2+x,11+2x^2},{x,0,40}]]] (* _Harvey P. Dale_, May 06 2013 *)
%K A052293 nonn,easy
%O A052293 1,1
%A A052293 Stuart M. Ellerstein (ellerstein(AT)aol.com), Feb 08 2000
%E A052293 Corrected and extended by _James Sellers_, Feb 10 2000