A186976 Number of ordered quintuples of distinct pairwise coprime positive integers with largest element n.

2, 1, 3, 0, 26, 1, 72, 9, 14, 29, 228, 15, 431, 55, 115, 75, 928, 70, 743, 205, 633, 225, 2499, 70, 3571, 958, 1085, 728, 1626, 350, 6979, 1231, 2061, 822, 10800, 450, 13978, 2361, 2750, 2772, 20114, 1507, 15718, 2761, 7370, 4422, 33082, 2457, 13971

Offset

7,1

Links

Alois P. Heinz, Table of n, a(n) for n = 7..200

Example

a(7) = 2 because there are 2 ordered quintuples of distinct pairwise coprime positive integers with largest element 7: (1,2,3,5,7), (1,3,4,5,7).

Crossrefs

Column 5 of triangle A186972. First differences of A015698.

Sequence in context: A160169 A117778 A072127 * A160550 A172038 A331363

Adjacent sequences: A186973 A186974 A186975 * A186977 A186978 A186979

Keyword

nonn

Author

Alois P. Heinz, Mar 01 2011

Status

approved