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 A070128 #7 Mar 30 2012 18:50:20 %S A070128 5,8,13,14,20,21,25,29,30,32,36,37,41,42,44,49,52,56,57,59,61,62,66, %T A070128 67,69,74,75,77,78,79,80,86,89,96,97,99,100,101,102,104,105,110,111, %U A070128 113,115,118,122,123,125,126,127,128,130,131,133 %N A070128 Numbers n such that [A070080(n), A070081(n), A070082(n)] is an obtuse integer triangle with relatively prime side lengths. %H A070128 R. Zumkeller, <a href="/A070080/a070080.txt">Integer-sided triangles</a> %e A070128 a(9)=30: [A070080(30), A070081(30), A070082(30)]=[3,5,7], A070084(30)=gcd(3,5,7)=1, A070085(30)=3^2+5^2-7^2=9+25-49=-15>0. %Y A070128 Cf. A070102, A070131, A070134, A070110, A070127. %K A070128 nonn %O A070128 1,1 %A A070128 _Reinhard Zumkeller_, May 05 2002