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 A065787 #6 Sep 17 2023 21:35:51 %S A065787 49,18,167,2401,4086461727,14079962896835441528, %T A065787 309880704108832516500624685064706000856, %U A065787 4681896102766617737298881383797502847166028831212571921983062786215145771871779 %N A065787 a(1) = 49; for n > 1, a(n) is the smallest integer > 0 such that the concatenation a(n)a(n-1)...a(2)a(1) is a square. %C A065787 a(n) = A061363(n+1) for n > 1. %Y A065787 Cf. A061359, A061363, A065691, A065785, A065786. %K A065787 base,nonn %O A065787 1,1 %A A065787 _Klaus Brockhaus_, Nov 19 2001