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 A067072 #14 Dec 15 2017 17:35:49 %S A067072 0,1,4,9,169,4489,69696,2778889,277788889,8998988769,2699997789889, %T A067072 898999897988929,498999778899898896,969988797999759789889, %U A067072 1679898987989978888999689 %N A067072 a(n) = smallest square m^2 such that the sum of the digits of m^2 is equal to n^2. %F A067072 a(n) = A061912(n)^2. %e A067072 a(5) = 4489 = 67^2 as it is the smallest square whose digit sum = 25 = 5^2. %Y A067072 Cf. A061912, A067074. %K A067072 nonn,base %O A067072 0,3 %A A067072 _Amarnath Murthy_, Jan 05 2002 %E A067072 More terms from _Jason Earls_, Jan 09 2002 %E A067072 a(11)-a(14) from _Donovan Johnson_, Jul 10 2012 %E A067072 a(0)=0 prepended by _Seiichi Manyama_, Aug 12 2017