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 A160686 #17 Aug 09 2017 22:03:01
%S A160686 1,2,4,8,16,32,64
%N A160686 Numbers n such that n/A000005(A000045(n)) is an integer.
%C A160686 The first power of 2 not in this sequence is 2^7 = 128, because 128/A000005(A000045(128)) = 1/2, which is not an integer. - _Nathaniel Johnston_, May 08 2011
%C A160686 Next term, if it exists, is greater than 3000. Conjecture: the sequence is finite and complete. - _Max Alekseyev_, May 21 2011
%F A160686 {n: A063375(n) | n}. - _R. J. Mathar_, May 25 2009
%p A160686 with(combinat):with(numtheory): A160686 := proc(n) option remember: local k: if(n=1)then return 1:fi: for k from procname(n-1)+1 do if(k mod tau(fibonacci(k))=0)then return k:fi: od: end: seq(A160686(n),n=1..7); # _Nathaniel Johnston_, May 08 2011
%Y A160686 Cf. A000005, A000045, A000079, A160683.
%K A160686 nonn,hard,more
%O A160686 1,2
%A A160686 _Ctibor O. Zizka_, May 23 2009
%E A160686 Inverted division in the definition - _R. J. Mathar_, May 25 2009
%E A160686 Erroneous term a(5) = 12 removed by _Nathaniel Johnston_, May 08 2011