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 A119885 #11 Sep 05 2019 11:10:22 %S A119885 1,2,3,4,5,6,7,8,9,10,11,13,14,15,17,19,21,22,23,25,26,27,29,31,33,34, %T A119885 35,37,38,39,41,43,46,47,49,51,53,55,57,58,59,61,62,64,65,67,69,71,73, %U A119885 74,77,79,82,83,85,86,87,89,91,93,94,95,97,101,103 %N A119885 Natural numbers with number of divisors equal to a Lucas number. %H A119885 Amiram Eldar, <a href="/A119885/b119885.txt">Table of n, a(n) for n = 1..10000</a> %t A119885 lim = 250; t = LucasL /@ Range[0, lim]; Select[Range@ lim, MemberQ[t, DivisorSigma[0, #]] &] (* _Amiram Eldar_, Sep 05 2019 after _Michael De Vlieger_ at A123193 *) %Y A119885 For natural numbers with number of divisors equal to a Fibonacci number, see A123193. [corrected by _Matthew Vandermast_, Oct 29 2008] %Y A119885 Cf. A000032. %K A119885 easy,nonn %O A119885 1,2 %A A119885 _Giovanni Teofilatto_, Aug 01 2006