%I #19 Apr 23 2022 23:01:43
%S 1,1,21,34,55,377,4181,6765,17711,121393,196418,317811,1346269,
%T 2178309,5702887,102334155,165580141,32951280099,53316291173,
%U 139583862445,956722026041,2504730781961,10610209857723,308061521170129
%N Squarefree Fibonacci numbers with an even number of prime factors (mu(n)=1).
%H Amiram Eldar, <a href="/A075735/b075735.txt">Table of n, a(n) for n = 1..505</a> (terms 1..100 from T. D. Noe)
%e 21 is a Fibonacci number and 21=3*7, 34 is a Fibonacci numbers and 34=2*17, ...
%p with(combinat, fibonacci): m1_fib := proc(n); if (numtheory[mobius](fibonacci(n))=1) then RETURN(fibonacci(n)); fi; end: seq(m1_fib(i), i=1..100);
%Y Subsequence of A061305 (squarefree Fibonacci numbers).
%Y Cf. A000045, A030229, A074691.
%Y Cf. A022307, A053409, A072381.
%K easy,nonn
%O 1,3
%A _Jani Melik_, Oct 07 2002