OFFSET
1,2
LINKS
Alois P. Heinz, Table of n, a(n) for n = 1..10000
EXAMPLE
a(6) = 4 because there are 4 subsets of {1,2,3,4,5,6} containing 6 and having <=3 pairwise coprime elements: {6}, {1,6}, {5,6}, {1,5,6}.
CROSSREFS
KEYWORD
nonn,look
AUTHOR
Alois P. Heinz, Mar 03 2011
STATUS
approved