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 A180221 #15 Jun 02 2020 08:50:40
%S A180221 2,3,5,7,8,9,10,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,
%T A180221 30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,
%U A180221 53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75
%N A180221 Numbers that can be written as sum of one or more distinct elements of A000043. Numbers k for which sigma(A180162(k))=2^k, k>=2.
%C A180221 The distinct values of log_2(sigma(m)), where m > 1 is a term of A046528. - _Amiram Eldar_, Jun 02 2020
%H A180221 Amiram Eldar, <a href="/A180221/b180221.txt">Table of n, a(n) for n = 1..10000</a> (terms 1..1855 from Walter A. Kehowski)
%t A180221 n = 10; p = MersennePrimeExponent[Range[n]]; Rest[-1 + Position[CoefficientList[Series[Product[(1 + x^p[[k]]), {k, 1, n}], {x, 0, p[[-1]]}], x], _?(# > 0 &)] // Flatten] (* _Amiram Eldar_, Jun 02 2020 *)
%Y A180221 Cf. A000043, A180162, A046528, A180169. Complement of A078426.
%K A180221 nonn
%O A180221 1,1
%A A180221 _Walter Kehowski_, Aug 16 2010