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 A069600 #9 May 18 2020 22:40:02 %S A069600 1,121,3721,13924,135424,1236544,13527684,13527684,139854276, %T A069600 11738205649,10112819764356,1011123678945241,10118426359171321, %U A069600 10111134329645378121,1011111632116847554329,10111124953183456116721,1011111119736855441726321,101111112641746351915327881,10111111111271587168434259369 %N A069600 Smallest square containing all the digits of numbers from 1 to n. For a(10) and higher, all duplicated digits must be in the term (for example a(10) has two 1's). %e A069600 a(5) = 335241 = 579^2 contains digits 1,2,3,4 and 5. %Y A069600 Cf. A088628. %K A069600 nonn,base,more %O A069600 1,2 %A A069600 _Amarnath Murthy_, Mar 25 2002 %E A069600 Corrected and extended by Larry Reeves (larryr(AT)acm.org), Jan 20 2003 %E A069600 a(14)-a(15) from _Giovanni Resta_, Aug 06 2019 %E A069600 a(16)-a(19) from _Chai Wah Wu_, May 18 2020