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 A243176 #8 Jun 20 2014 14:59:33 %S A243176 0,1,4,8,9,10,14,16,20,25,28,31,32,35,36,38,40,47,49,50,56,64,67,70, %T A243176 72,76,80,81,82,90,95,98,100,112,118,121,124,125,126,128,131,133,140, %U A243176 142,144,149,152,160,164,169,173,175,180,188,190,194,196,200,202,205,206,214,218,224,225,226,227,236,245,248,250,252,256,266,268,279,280,283,284,287 %N A243176 Numbers of the form x^2+xy+8y^2. %C A243176 Discriminant -31. %H A243176 N. J. A. Sloane et al., <a href="https://oeis.org/wiki/Binary_Quadratic_Forms_and_OEIS">Binary Quadratic Forms and OEIS</a> (Index to related sequences, programs, references) %t A243176 ofTheFormQ[n_] := Reduce[n == x^2 + x*y + 8*y^2, {x, y}, Integers] =!= False; Select[Range[0, 300], ofTheFormQ] (* _Jean-François Alcover_, Jun 04 2014 *) %Y A243176 Primes: A033221. %K A243176 nonn %O A243176 1,3 %A A243176 _N. J. A. Sloane_, Jun 02 2014