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 A121502 #5 Sep 20 2023 05:51:16 %S A121502 3,4,5,6,8,10,11,12,13,15,22,27,34,46,58,63,70,75,87,128,157,198 %N A121502 Companion sequence for A121501 used in a unit circle area approximation problem. %C A121502 The pairs (n(k),m(k)):=(A121501(k),a(k)), k>=1, lead to a strictly decreasing sequence of relative errors E(n(k),m(k)) in the circle area approximation problem described in A121500. For each k=1,2,... the unit circle has inscribed n(k)-gon and circumscribed m(k)-gon. %C A121502 For the sequence of relative errors E(n(k),m(k)), k=1..20 see the W. Lang link in A121501. %F A121502 a(k) = A121500(A121501(k)), k>=1. %e A121502 (n(k),m(k)) pairs (A121501(k),a(k)), for k=1..7: [3, 3], [5, 4], [6, 5], [8, 6], [11, 8], [14, 10], [15, 11]. %K A121502 nonn,more %O A121502 1,1 %A A121502 _Wolfdieter Lang_, Aug 16 2006