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 A137838 #3 Mar 31 2012 14:39:55 %S A137838 1,3,4,5,7,8,10,11,2,13,4,5,16,7,8,19,21,2,23,4,5,6,7,8,29,0 %N A137838 Limiting sequence when we start with the positive integers (A000027) and delete in step n >= 1 the first digit in the term at position n + a(n). %e A137838 First few steps are: %e A137838 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,... %e A137838 n = 1; delete the first digit in the term at position 1+a(1) = 2: 2; %e A137838 1,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,... %e A137838 n = 2; delete the first digit in the term at position 2+a(2) = 5: 6; %e A137838 1,3,4,5,7,8,9,10,11,12,13,14,15,16,17,18,19,20,... %e A137838 n = 3; delete the first digit in the term at position 3+a(3) = 7: 9; %e A137838 1,3,4,5,7,8,10,11,12,13,14,15,16,17,18,19,20,... %e A137838 n = 4; delete the first digit in the term at position 4+a(4) = 9: 1; %e A137838 1,3,4,5,7,8,10,11,2,13,14,15,16,17,18,19,20,... %e A137838 n = 5; delete the first digit in the term at position 5+a(5) = 12: 1; %e A137838 1,3,4,5,7,8,10,11,2,13,14,5,16,17,18,19,20,... %e A137838 n = 6; delete the first digit in the term at position 6+a(6) = 14: 1; %e A137838 1,3,4,5,7,8,10,11,2,13,14,5,16,7,18,19,20,... %Y A137838 Cf. A137292, A136120, A136119, A136259, A136272, A137319, A137417, A137418. %K A137838 easy,nonn,base %O A137838 1,2 %A A137838 _Ctibor O. Zizka_, Apr 29 2008