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 A087095 #15 Jun 23 2019 16:59:14
%S A087095 0,5,24,96,176,625,1316,13025,0,14129,24161,580921,1310976,4588964,
%T A087095 7007601,0,233634401,244436761,2180575376,3762025,23492302009,
%U A087095 71829444801,293908889924,357018382249,2562501107225,2194311769649
%N A087095 a(n) = A077503(n) - n*10^d, where d = n-A055642(n), A055642(n) = number of digits in n.
%F A087095 a(n) = ceiling(sqrt(n*10^d))^2 - n*10^d, where d = n-digit(n), digit(n) = number of digits in n.
%e A087095 a(7) = 7001316 - 7000000 = 1316.
%t A087095 ceil[n_]:=Module[{d=n-IntegerLength[n],c},c=n*10^d;Ceiling[Sqrt[c]]^2-c]; Array[ceil,30] (* _Harvey P. Dale_, Sep 03 2018 *)
%Y A087095 Cf. A055642, A077503.
%K A087095 nonn,base
%O A087095 1,2
%A A087095 _Ray Chandler_, Aug 11 2003
%E A087095 Edited by _Charles R Greathouse IV_, Aug 03 2010