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 A062118 #14 Jul 17 2021 04:30:13
%S A062118 1,50,60,250,3792,7600,376000,495475,625000,971582,66952741,93760000,
%T A062118 177656344,3199268655,9062500000,10937600000,788138178328,
%U A062118 860628177919,890625000000,2291665833333,2780225311054,2890625000000,71093760000000,128906250000000
%N A062118 Numbers k such that k^2 has k as its middle digits.
%C A062118 Some of the terms are automorphic numbers (A003226) multiplied by an appropriate power of 10. a(25) > 10^15. - _Giovanni Resta_, Jul 29 2013
%D A062118 Computed by _Robert Israel_.
%e A062118 a(5)=3792 because 3792^2 = 14379264 has 3792 as its middle digits.
%t A062118 Do[ If[ StringPosition[ ToString[n^2], ToString[n]] [[1, 1]] == (Ceiling[ Log[10, n^2] ] - Ceiling[ Log[10, n] ])/2 + 1, Print[n] ], {n, 1, 10^9} ]
%Y A062118 k^2 is given in A062120.
%K A062118 nonn,base,nice
%O A062118 1,2
%A A062118 Brian Wallace (wallacebrianedward(AT)yahoo.co.uk), Jun 28 2001
%E A062118 Corrected and extended by _Robert G. Wilson v_, Aug 08 2001
%E A062118 a(15)-a(24) from _Giovanni Resta_, Jul 29 2013