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 A080780 #13 Aug 22 2025 06:28:07 %S A080780 2,6,7,8,9,12,18,24,30,31,32,36,37,38,39,40,41,42,43,44,45,46,47,48, %T A080780 49,50,51,52,53,54,60,66,67,68,69,72,78,84,90,96,102,108,114,120,126, %U A080780 132,138,144,150 %N A080780 a(1)=2; for n > 1, a(n) is the smallest integer greater than a(n-1) consistent with the condition "n is in the sequence if and only if a(n) is congruent to 0 (mod 6)". %D A080780 J.-P. Allouche, N. Rampersad and J. Shallit, On integer sequences whose first iterates are linear, Aequationes Math. 69 (2005), 114-127 %H A080780 B. Cloitre, N. J. A. Sloane and M. J. Vandermast, <a href="http://www.cs.uwaterloo.ca/journals/JIS/VOL6/Cloitre/cloitre2.html">Numerical analogues of Aronson's sequence</a>, J. Integer Seqs., Vol. 6 (2003), #03.2.2. %H A080780 B. Cloitre, N. J. A. Sloane and M. J. Vandermast, <a href="http://arXiv.org/abs/math.NT/0305308">Numerical analogues of Aronson's sequence</a> (math.NT/0305308) %H A080780 <a href="/index/Aa#aan">Index entries for sequences of the a(a(n)) = 2n family</a> %Y A080780 Cf. A079000. %K A080780 nonn %O A080780 1,1 %A A080780 _Benoit Cloitre_, Feb 23 2003