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 A109512 #12 Mar 14 2015 17:08:12
%S A109512 0,1,3,6,9,13,17,22,27,32,38,44,50,57,64,71,78,86,94,102,110,119,128,
%T A109512 137,146,156,166,176,186,196,207,218,229,240,251,263,275,287,299,311,
%U A109512 324,337,350,363,376,389,403,417,431,445,459,473,488,503,518,533,548
%N A109512 Integers which are not the sum of n and A001462(n).
%C A109512 Terms computed by _Robert G. Wilson v_.
%H A109512 Robert Price, <a href="/A109512/b109512.txt">Table of n, a(n) for n = 0..9999</a>
%e A109512 Let N=succession of the natural numbers, G=Golomb self-describing sequence, S=sum of n and according G(n):
%e A109512 N=1.2.3.4.5..6..7..8..9.10.11.12.13.14.15.16.17.18.19.20.21.22
%e A109512 G=1,2,2,3,3,.4,.4,.4,.5,.5,.5,.6,.6,.6,.6,.7,.7,.7,.7,.8,.8,.8
%e A109512 S=2.4.5.7.8.10.11.12.14.15.16.18.19.20.21.23.24.25.26.28.29.30
%e A109512 Integers not in S (0,1,3,6,9,13,17,22...) form the sequence.
%t A109512 a[1] = 1; a[n_] := a[n] = 1 + a[n - a[a[n - 1]]]; Do[ a[n], {n, 10^5}]; h = Complement[ Range[100000 + a[10^5]], Table[n + a[n], {n, 10000}]] t = Table[n + Sum[PrimePi[k], {k, 1, n}], {n, 0, 1200}]
%K A109512 base,easy,nonn
%O A109512 0,3
%A A109512 _Eric Angelini_, _Alexandre Wajnberg_ and _Robert G. Wilson v_, Aug 29 2005