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 A300165 #16 Mar 14 2021 14:26:48 %S A300165 47,72,73,83,98,112,122,123,128,132,133,138,142,148,157,162,172,173, %T A300165 174,177,183,187,191,192,200,203,208,212,213,216,217,228,233,237,242, %U A300165 252,253,255,265,268,273,278,288,293,294,302,307,313,317,319 %N A300165 Numbers m such that m^2 + 1 can be expressed in more than one way as j^2 + k^2 with j > k > 1 and gcd(j,k) = 1. %C A300165 The sequence differs from A299707 by the gcd condition, which excludes representations like 18^2 + 1 = 15^2 + 10^2, 32^2 + 1 = 25^2 + 20^2, 38^2 + 1 = 34^2 + 17^2. %H A300165 Hugo Pfoertner, <a href="/A300165/b300165.txt">Table of n, a(n) for n = 1..10000</a> %e A300165 a(1) = 47 because its 3 representations satisfy the conditions j > k > 1 and gcd(j,k) = 1: 47^2 + 1 = 2210 = 43^2 + 19^2 = 41^2 + 23^2 = 37^2 + 29^2. %Y A300165 Cf. A050796, A299707, A300166, A300167, A300168. %K A300165 nonn %O A300165 1,1 %A A300165 _Hugo Pfoertner_, Feb 27 2018