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 A139546 #9 Jan 25 2014 16:39:16
%S A139546 0,1,4,5,6,9,9,14,16,20,21,21,24,25,29,30,36,36,41,45,45,46,49,49,54,
%T A139546 54,56,61,64,69,69,70,80,81,81,81,84,84,86,89,94,96,100,101,105,105,
%U A139546 109,116,120,121,125,126,126,126,129,129,134,141,141,144,144,145,149,150
%N A139546 Numbers of form x^2+5y^2 (x>=0,y>=0) with repetition.
%C A139546 Primes in the sequence occur only once.
%D A139546 David A. Cox, "Primes of the Form x^2 + n y^2", Wiley, 1989.
%e A139546 0 = 0^2+5*0^2,
%e A139546 9 = 2^2+5*1^2 = 3^2+5*0^2,
%e A139546 81 = 1^2+5*4^2 = 6^2+5*3^2 = 9^2+5*0^2,
%e A139546 441: {x,y}={6,9},{11,8},{14,7},{19,4},{21,0}.
%Y A139546 Cf. A033205.
%K A139546 nonn
%O A139546 1,3
%A A139546 _Zak Seidov_, Apr 26 2008