A090229 Differences between consecutive nonprime Fibonacci numbers (A090206).

1, 0, 7, 13, 13, 21, 89, 233, 233, 377, 1597, 1597, 2584, 4181, 6765, 28657, 28657, 46368, 75025, 121393, 514229, 514229, 832040, 1346269, 2178309, 3524578, 5702887, 9227465, 14930352

Offset: 0

Author

Felix Tubiana, Jan 22 2004

Keywords

• easy
• nonn

Crossrefs

Cf. A090206.

Formula

F(0) = 0; F(1) = 1; F(n) = F(n-1) + F(n-2); F(0:9) = 0, 1, 1, 2, 3, 5, 8, 13, 21, 34 nonprimes: 0, 1, 1, 8, 21 differences between consecutive nonprimes: 1, 0, 7, 13