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 A065778 #7 Sep 17 2023 21:32:53 %S A065778 16,21,602,9919,201825782,786148373230451374, %T A065778 222497947677972243238266280556039145, %U A065778 689281060145549220555862860288211510118547777224654163905516661857896088 %N A065778 a(1) = 16; 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 A065778 Cf. A061359, A065691, A065776, A065777. %K A065778 base,nonn %O A065778 1,1 %A A065778 _Klaus Brockhaus_, Nov 19 2001 %E A065778 More terms from Ulrich Schimke (ulrschimke(AT)aol.com), Dec 18 2001