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 A098727 #8 Mar 25 2022 17:37:43
%S A098727 2,4,6,8,10,12,14,16,18,11,11,13,14,15,17,17,20,19,23,21,26,23,29,25,
%T A098727 32,27,35,29,38,32,31,34,34,36,37,38,40,40,43,42,46,44,49,46,52,48,55,
%U A098727 50,58,53,51,55,54,57,57,59,60,61,63,63,66,65,69,67,72,69,75,71,78,74,71
%N A098727 Consider the sequence {b(n), n >= 1} of digits of the natural (or counting) numbers: 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0... (A007376); a(n) = b(n) + n.
%C A098727 Add each digit of the counting numbers to its rank.
%H A098727 Harvey P. Dale, <a href="/A098727/b098727.txt">Table of n, a(n) for n = 1..1000</a>
%e A098727 The sequence of digits of the counting numbers is
%e A098727 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0...
%e A098727 The 15th term, for instance, is a 2. Thus 2+15=17 is the 15th term of this sequence.
%t A098727 Module[{dcn=Flatten[IntegerDigits/@Range[70]]},Total/@Thread[ {dcn,Range[ Length[dcn]]}]] (* _Harvey P. Dale_, Mar 25 2022 *)
%Y A098727 Cf. A007376, A033307, A098728, A098729, A098732, A098733, A098734.
%K A098727 base,easy,nonn
%O A098727 1,1
%A A098727 _Alexandre Wajnberg_, Sep 30 2004
%E A098727 More terms from _Joshua Zucker_, May 18 2006