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 A360280 #13 Feb 17 2023 21:44:26 %S A360280 25,169,289,625,841,1369,1681,2809,3721,4225,5329,7225,7921,9409, %T A360280 10201,11881,12769,15625,18769,21025,22201,24649,28561,29929,32761, %U A360280 34225,37249,38809,42025,48841,52441,54289,58081,66049,70225,72361,76729,78961,83521,85849,93025,97969 %N A360280 Squares that are the hypotenuse of a primitive Pythagorean triangle. %C A360280 All terms are congruent to 1 (mod 8). %F A360280 a(n) = A008846(n)^2. %e A360280 169 is a term because 169 = 13^2 and (119,120,169) is a primitive Pythagorean triangle. %Y A360280 Cf. A000290, A008846, A020882, A198436. %K A360280 nonn %O A360280 1,1 %A A360280 _Alexandru Petrescu_, Feb 01 2023