A015698 Number of 5-tuples of different integers from [ 1,n ] with no common factors among pairs.

0, 0, 0, 0, 0, 0, 2, 3, 6, 6, 32, 33, 105, 114, 128, 157, 385, 400, 831, 886, 1001, 1076, 2004, 2074, 2817, 3022, 3655, 3880, 6379, 6449, 10020, 10978, 12063, 12791, 14417, 14767, 21746, 22977, 25038, 25860, 36660, 37110, 51088, 53449, 56199

Offset

1,7

Links

Table of n, a(n) for n=1..45.

Crossrefs

Column 5 of triangle A186974. Partial sums of A186976.

Sequence in context: A057545 A015628 A060692 * A068587 A218954 A182560

Adjacent sequences: A015695 A015696 A015697 * A015699 A015700 A015701

Keyword

nonn

Author

Olivier Gérard

Status

approved