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 A081331 #9 Mar 26 2025 08:30:48
%S A081331 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,21,22,23,24,
%T A081331 25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,43,43,44,45,
%U A081331 46,47,48,48,49,50,51,52,53,54,55,55,56,57,58,59,60,61,62,62,63,63,64,65
%N A081331 Number of numbers <= n that can be written as sum of two 3-smooth numbers.
%H A081331 Amiram Eldar, <a href="/A081331/b081331.txt">Table of n, a(n) for n = 1..10000</a>
%t A081331 With[{max = 100}, sm = Select[Range[max], # == Times @@ ({2, 3}^IntegerExponent[#, {2, 3}]) &]; Accumulate@ Table[Boole[IntegerPartitions[n, {2}, sm] != {}], {n, 1, max}]] (* _Amiram Eldar_, Mar 26 2025 *)
%Y A081331 Cf. A081330, A081326, A003586, A081329.
%K A081331 nonn
%O A081331 1,3
%A A081331 _Reinhard Zumkeller_, Mar 19 2003