A186978 Number of ordered septuples of distinct pairwise coprime positive integers with largest element n.

6, 0, 0, 2, 56, 1, 219, 13, 27, 15, 777, 28, 640, 102, 563, 127, 3923, 28, 7859, 1792, 1505, 966, 2354, 392, 21313, 2289, 3969, 1344, 42828, 714, 69360, 7566, 8118, 8826, 122883, 5082, 93084, 10890, 33594, 19338, 266024, 11011, 82350, 23298, 63917

Offset

13,1

Links

Alois P. Heinz, Table of n, a(n) for n = 13..200

Example

a(16) = 2 because there are 2 ordered septuples of distinct pairwise coprime positive integers with largest element 16: (1,3,5,7,11,13,16), (1,5,7,9,11,13,16).

Crossrefs

Column 7 of triangle A186972. First differences of A186983.

Sequence in context: A267333 A337885 A333204 * A228532 A019956 A212720

Adjacent sequences: A186975 A186976 A186977 * A186979 A186980 A186981

Keyword

nonn

Author

Alois P. Heinz, Mar 02 2011

Status

approved