A187270 - OEIS

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A187270

Number of nonempty subsets of {1, 2, ..., n} with <=9 pairwise coprime elements.

2

1, 3, 7, 11, 23, 27, 55, 71, 103, 115, 231, 247, 495, 543, 615, 727, 1455, 1519, 3039, 3231, 3615, 3871, 7735, 7991, 11151, 11887, 14631, 15463, 30683, 30939, 60578, 67646, 73813, 77845, 87284, 89054, 171020, 179960, 195265

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

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

FORMULA

a(n) = A187262(n,9).

CROSSREFS

Column 9 of triangle A187262. First differences are A186993.

Sequence in context: A187267 A187268 A187269 * A187271 A187106 A111668

Adjacent sequences: A187267 A187268 A187269 * A187271 A187272 A187273

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Mar 07 2011

STATUS

approved