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 A277947 #14 Sep 08 2022 08:46:17 %S A277947 12321,123201,130321,1232100,1320201,3101121,12320100,13032100, %T A277947 102030201,102232321,103002201,123210000,123232201,132020100, %U A277947 310112100,1232010000,1303210000,1322122321,1332323001,2103231321,10022212321,10130221201,10203020100,10203222121 %N A277947 Squares whose largest decimal digit is 3. %C A277947 A subsequence of A000290. %H A277947 Colin Barker, <a href="/A277947/b277947.txt">Table of n, a(n) for n = 1..100</a> %o A277947 (PARI) L=List(); for(n=1, 10000, if(vecmax(digits(n^2))==3, listput(L, n^2))); Vec(L) %o A277947 (Magma) [n^2: n in [1..1000000] | Maximum(Intseq(n^2)) eq 3]; // _Vincenzo Librandi_, Nov 06 2016 %Y A277947 Cf. A000290. %Y A277947 Cf. A277946, A277948, A277960. %K A277947 nonn,easy,base %O A277947 1,1 %A A277947 _Colin Barker_, Nov 05 2016