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 A072586 #9 Sep 18 2022 02:02:49
%S A072586 0,1,2,2,3,4,5,6,6,7,8,8,9,10,11,11,12,12,13,13,14,15,16,17,17,18,19,
%T A072586 19,20,21,22,23,24,25,26,26,27,28,29,30,31,32,33,33,33,34,35,35,35,35,
%U A072586 36,36,37,38,39,40,41,42,43,43,44,45,45,45,46,47,48,48,49,50,51,51,52
%N A072586 Number of numbers <= n having prime factors with odd exponents only.
%H A072586 Amiram Eldar, <a href="/A072586/b072586.txt">Table of n, a(n) for n = 1..10000</a>
%F A072586 a(n) ~ c * n , where c = A065463. - _Amiram Eldar_, Sep 18 2022
%t A072586 Accumulate @ Table[If[n > 1 && AllTrue[FactorInteger[n][[;; , 2]], OddQ], 1, 0], {n, 1, 100}] (* _Amiram Eldar_, Sep 18 2022 *)
%Y A072586 Cf. A000196, A002035, A065463, A295316.
%K A072586 nonn
%O A072586 1,3
%A A072586 _Reinhard Zumkeller_, Jun 23 2002