Fibonacci numbers with nonprime indices.

Terms

a(0) =0a(1) =1a(2) =3a(3) =8a(4) =21a(5) =34a(6) =55a(7) =144a(8) =377a(9) =610a(10) =987a(11) =2584a(12) =6765a(13) =10946a(14) =17711a(15) =46368a(16) =75025a(17) =121393a(18) =196418a(19) =317811a(20) =832040a(21) =2178309a(22) =3524578a(23) =5702887a(24) =9227465a(25) =14930352a(26) =39088169a(27) =63245986a(28) =102334155a(29) =267914296