A182600 Run length of the n-th run of Fibonacci composites.

1, 3, 1, 3, 5, 5, 13, 3, 35, 47, 5, 221, 71, 1, 15, 59, 59, 1, 2399, 1751, 663, 3923, 365, 4753, 11129, 5195, 5241, 1511, 13321, 31005, 23071, 25109, 18069, 53015, 196271, 36401, 156259, 3647, 11021, 326805, 118379, 235709, 350399, 167051, 165661, 935631

Offset: 1

Author

R. J. Mathar, Nov 22 2010

Keywords

• nonn

Comments

There is no upper bound to the entries: F_{k*n} is divisible by F_k, so whenever integers j, j+1, ..., j+n are composite (and > 4), F_j, ..., F_{j+n} are also composite. - Robert Israel, Nov 19 2010

Examples

			The first run contains A000045(6), the second A000045(8..10), the third A000045(12), the fourth A000045(14..16).
		

Crossrefs

Cf. A000045, A001605.

Formula

a(n) = A001605(n+3)-A001605(n+2)-1.