A187266 Number of nonempty subsets of {1, 2, ..., n} with <=5 pairwise coprime elements.

1, 3, 7, 11, 23, 27, 55, 71, 103, 115, 225, 241, 450, 496, 565, 663, 1170, 1227, 2055, 2196, 2473, 2666, 4257, 4420, 5709, 6122, 7223, 7664, 11449, 11612, 16776, 18255, 19991, 21178, 23718, 24327, 33888, 35767, 38853, 40157, 54455

Offset: 1

Author

Alois P. Heinz, Mar 07 2011

Keywords

• nonn

Links

• Alois P. Heinz, Table of n, a(n) for n = 1..200

Crossrefs

Column 5 of triangle A187262. First differences are A186989.

Formula

a(n) = A187262(n,5).