A090207 Number of factors of n-th nonprime Fibonacci number.

1, 1, 1, 3, 2, 2, 2, 6, 2, 3, 3, 5, 2, 4, 3, 2, 9, 3, 2, 4, 4, 7, 2, 4, 3, 2, 3, 10, 3, 3

Offset: 0

Author

Felix Tubiana, Jan 22 2004

Keywords

• easy
• nonn

Crossrefs

Cf. A090206, A000045.

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 The nonprime numbers are: 0, 1, 1, 8, 21, 34 which have number of factors: 1, 1, 1, 3, 2, 2