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 A128009 #7 Oct 11 2017 05:08:44 %S A128009 1,4,2,3,6,1,8,6,4,3,14,2,5,8,10,6,10,1,12,8,6,4,10,3,5,12,2,7,8,14,3, %T A128009 4,14,5,26,17,6,7,1,16,14,12,10,8,7,6,5,14,4,10,16,3,12,7,2,9,16,18,8, %U A128009 14,3,7,18,22,9,14,16,6,13,14,18,1 %N A128009 Denominators of rational-valued radii of circles given by 3 distinct integer points in the 3-dimensional Euclidean space. %C A128009 See A128008. %Y A128009 See A128008 for numerators. Cf. A128006, A128007, A128010, A128011. %K A128009 frac,nonn %O A128009 1,2 %A A128009 _Heinrich Ludwig_, Feb 14 2007