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 A065784 #8 Sep 17 2023 21:35:55 %S A065784 36,19,603,155636,4615730086,8967254090271143, %T A065784 56096202719698239565812734781810166, %U A065784 45033337806374635393337595037647446798889403018884984457350362192958678 %N A065784 a(1) = 36; 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. %Y A065784 Cf. A061359, A065691, A065782, A065783. %K A065784 base,nonn %O A065784 1,1 %A A065784 _Klaus Brockhaus_, Nov 19 2001 %E A065784 More terms from Ulrich Schimke (ulrschimke(AT)aol.com), Dec 18 2001