A075735 Squarefree Fibonacci numbers with an even number of prime factors (mu(n)=1).

1, 1, 21, 34, 55, 377, 4181, 6765, 17711, 121393, 196418, 317811, 1346269, 2178309, 5702887, 102334155, 165580141, 32951280099, 53316291173, 139583862445, 956722026041, 2504730781961, 10610209857723, 308061521170129

Offset

1,3

Links

Amiram Eldar, Table of n, a(n) for n = 1..505 (terms 1..100 from T. D. Noe)

Example

21 is a Fibonacci number and 21=3*7, 34 is a Fibonacci numbers and 34=2*17, ...

Maple

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);

Crossrefs

Subsequence of A061305 (squarefree Fibonacci numbers).

Cf. A000045, A030229, A074691.

Cf. A022307, A053409, A072381.

Sequence in context: A167397 A135595 A082483 * A053409 A253910 A144205

Adjacent sequences: A075732 A075733 A075734 * A075736 A075737 A075738

Keyword

easy,nonn

Author

Jani Melik, Oct 07 2002

Status

approved