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 A227393 #35 Aug 31 2013 16:35:33 %S A227393 1,124,12471013,12471013161922,12471013161922252831, %T A227393 124710131619222252831343740,124710131619222252831343740434649, %U A227393 124710131619222252831343740434649525558 %N A227393 a(n) = concatenation of first 3n terms of A033627. %C A227393 All entries are == 1 (mod 3). _V. T. Jayabalaji_, Jul 13 2013 %e A227393 124 is the concatenation of 1,2 and 4. %e A227393 12471013 is the concatenation of 1, 2, 4, 7 10 and 13. %Y A227393 Cf. A033627 %K A227393 nonn,less,base %O A227393 1,2 %A A227393 _V. T. Jayabalaji_, Jul 15 2013 %E A227393 Edited by _N. J. A. Sloane_, Jul 16 2013