A187267 Number of nonempty subsets of {1, 2, ..., n} with <=6 pairwise coprime elements.

1, 3, 7, 11, 23, 27, 55, 71, 103, 115, 231, 247, 489, 537, 609, 719, 1383, 1446, 2674, 2851, 3204, 3443, 6110, 6329, 8484, 9083, 10930, 11587, 19252, 19471, 31084, 34131, 37428, 39637, 44583, 45640, 69968, 73870, 80421, 82985

Offset

1,2

Links

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

Formula

a(n) = A187262(n,6).

Crossrefs

Column 6 of triangle A187262. First differences are A186990.

Sequence in context: A247380 A187265 A187266 * A187268 A187269 A187270

Adjacent sequences: A187264 A187265 A187266 * A187268 A187269 A187270

Keyword

nonn

Author

Alois P. Heinz, Mar 07 2011

Status

approved