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 A065781 #8 Sep 17 2023 21:32:20 %S A065781 25,2,1,8,162,70771,164268122,22882298366163557088, %T A065781 976324672198183536165095004791768497036, %U A065781 67395729561035485747722358417684895847812434249174374011671902126543092988774 %N A065781 a(1) = 25; 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 A065781 Cf. A061359, A065691, A061839, A065780. %K A065781 base,nonn %O A065781 1,1 %A A065781 _Klaus Brockhaus_, Nov 19 2001 %E A065781 More terms from Ulrich Schimke (ulrschimke(AT)aol.com), Dec 18 2001