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%I #24 Jul 05 2022 11:10:28
%S 0,1,1,8,21,34,55,144,377,610,987,2584,4181,6765,10946,17711,46368,
%T 75025,121393,196418,317811,832040,1346269,2178309,3524578,5702887,
%U 9227465,14930352,24157817,39088169
%N Nonprime Fibonacci numbers.
%C It is possible to find a run of at least length n (not necessarily exactly n) such that n consecutive terms in this sequence are also consecutive in the sequence of Fibonacci numbers. However, it is not possible for such a run to be of exactly length n if n is even. - _Alonso del Arte_, Nov 23 2010
%C Some terms of this sequence have prime indices in the sequence of Fibonacci numbers (A000045), see A050937. - _Alonso del Arte_, Aug 16 2013
%e 34 is in the sequence as it is a Fibonacci number and it is composite, the product of 2 and 17.
%e 55 is in the sequence as it is a Fibonacci number and it is composite, the product of 5 and 11.
%e 89 is not in the sequence because, although it is a Fibonacci number, it is prime.
%t Select[Fibonacci[Range[0, 50]], !PrimeQ[#] &] (* _Vladimir Joseph Stephan Orlovsky_, Jul 22 2008 *)
%Y Cf. A000045, A005478, A050937, A182602.
%K easy,nonn
%O 1,4
%A _Felix Tubiana_, Jan 22 2004
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