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 A118586 #9 Feb 20 2022 22:38:16
%S A118586 6,12,14,24,28,30,48,56,60,62,96,112,120,124,126,192,224,240,248,252,
%T A118586 254,384,448,480,496,504,508,510,768,896,960,992,1008,1016,1020,1022,
%U A118586 1536,1792,1920,1984,2016,2032,2040,2044,2046,3072,3584,3840,3968,4032
%N A118586 Numbers whose binary expansion contains group of at least two 1's followed by a nonempty group of 0's.
%C A118586 All terms are even.
%H A118586 Michael S. Branicky, <a href="/A118586/b118586.txt">Table of n, a(n) for n = 1..10000</a>
%F A118586 Sum_{n>=1} 1/a(n) = -1 + A065442. - _Amiram Eldar_, Feb 20 2022
%e A118586 4080_10 = 111111110000_2.
%t A118586 Sort[Flatten[Table[Sum[2^k,{k,k1,k2}],{k1,1,10},{k2,k1+1,11}]]]
%o A118586 (Python)
%o A118586 from itertools import count, islice
%o A118586 def agen(): # generator of terms
%o A118586 for d in count(3):
%o A118586 for i in range(2, d):
%o A118586 yield int("1"*i + "0"*(d-i), 2)
%o A118586 print(list(islice(agen(), 50))) # _Michael S. Branicky_, Feb 20 2022
%Y A118586 Cf. A043569, A065442.
%K A118586 base,nonn
%O A118586 1,1
%A A118586 _Zak Seidov_, May 07 2006