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 A158937 #20 Oct 19 2013 10:37:36
%S A158937 4,7,12,13,16,19,21,28,28,28,31,36,37,39,43,48,49,52,52,52,57,61,63,
%T A158937 64,67,73,76,76,76,79,84,84,84,91,91,93,97,100,103,108,109,111,112,
%U A158937 112,112,117,124,124,124,127,129,133,133,139,144,147,148,148,148,151,156,156,156,157,163,169,171,172,172,172,175,181,183,189,192,193,196,196,196,196,199,201,208,208,208,211,217,217,219,223,228,228,228,229,237,241,244,244,244,247
%N A158937 Numbers of the form x^2+3y^2 where x and y are positive integers (with repetitions).
%C A158937 Least integer m with exactly n repetitions, {m,n}: {4,1},{91,2},{28,3},{196,4},{31213,5},{364,6}, {9604,7},{53599,8},{2548,9},{470596,10}.
%C A158937 This is an important quadratic form with a small determinant, so a list of its values with repetition is of interest. - _N. J. A. Sloane_, Apr 02 2011
%e A158937 m=28: {x,y}={5,1},{4,2},{1,3}.
%Y A158937 Cf. A092572 Numbers of the form x^2+3y^2 where x and y are positive integers.
%K A158937 nonn
%O A158937 1,1
%A A158937 _Zak Seidov_, Mar 26 2011