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Fibonacci numbers F(k) when k is a product of an even number of distinct primes A030229 (mu(k)=1).
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%I #3 Mar 31 2012 14:39:59

%S 1,8,55,377,610,10946,17711,121393,3524578,5702887,9227465,39088169,

%T 63245986,1836311903,20365011074,139583862445,365435296162,

%U 591286729879,4052739537881,17167680177565,117669030460994

%N Fibonacci numbers F(k) when k is a product of an even number of distinct primes A030229 (mu(k)=1).

%e 14=2*7 and fibonacci(14)=377, 15=3*5 and fibonacci(15)=610,...

%p with(combinat, fibonacci): fib_m1dsk := proc(n); if (numtheory[mobius](n)=1) then RETURN(fibonacci(n)); fi; end: seq((fib_m1dsk((i))), i=1..100);

%Y Cf. A000045, A030229.

%K easy,nonn

%O 1,2

%A _Jani Melik_, Oct 07 2002