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 A065793 #6 Sep 17 2023 21:35:43 %S A065793 81,16,146,22086,31071113326,365107058344463715696, %T A065793 2684967738644586785227227090233956040549004, %U A065793 809079884187716191997158821357206898310718837487307207657194711477350102495950972665 %N A065793 a(1) = 81; 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 A065793 a(n) = A061359(n+1) for n > 1. %Y A065793 Cf. A061359, A065691, A065791, A065792. %K A065793 base,nonn %O A065793 1,1 %A A065793 _Klaus Brockhaus_, Nov 19 2001