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 A227861 #8 Nov 01 2013 21:42:17 %S A227861 2,3,3,4,4,5,4,5,6,5,6,5,7,6,7,6,8,7,6,8,7,9,8,7,9,8,7,10,9,8,10,9,8, %T A227861 11,10,9,8,11,10,9,12,11,10,9,12,11,10,13,9,12,11,10,13,12,11,14,10, %U A227861 13,12,11,14,10,13,12,15,11,14,13,12,15,11,14,13,16,12,15,11,14,13,16,12,15,14,17,13,16,12,15,14,17,13,16,12,15,18,14,17,13 %N A227861 Sum i + j for integers 2^i*3^j (A033845). %C A227861 Upper and lower boundaries of the graph are almost exactly quadratic curves. %H A227861 Zak Seidov, <a href="/A227861/b227861.txt">Table of n, a(n) for n = 1..10000</a> %F A227861 a(n) = A191475(n) + A191476(n). %e A227861 a(10) = 5 because A033845(10) = 108 = 2^2 + 3^3 => A191475(10) = 2, A191476(10) = 3. %Y A227861 Cf. A033845, A191475, A191476. %K A227861 nonn %O A227861 1,1 %A A227861 _Zak Seidov_, Nov 01 2013