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 A077725 #8 Mar 09 2019 00:21:23 %S A077725 4,4,4,25,36,49,9,9,100,121,144,169,196,16,16,289,324,361,400,441,484, %T A077725 529,25,25,676,729,784,841,900,961,1024,1089,1156,36,36,1369,1444, %U A077725 1521,1600,1681,1764,1849,1936,2025,2116,2209,49,49,2500,2601,2704,2809,2916 %N A077725 a(n) = smallest square > 1 which can be expressed as a sum of distinct powers of n. %C A077725 a(n) = smallest square whose base n representation contains only 0's and 1's. %F A077725 a(1) = 4, a(k^2-1) = a(k^2) = k^2, a(n) = n^2 otherwise. - _Charlie Neder_, Mar 08 2019 %Y A077725 Cf. A077724. %K A077725 nonn %O A077725 2,1 %A A077725 _Amarnath Murthy_, Nov 19 2002 %E A077725 Corrected and extended by _Ray Chandler_, Sep 04 2003