A186981 - OEIS

A186981

Number of ordered 10-tuples of distinct pairwise coprime positive integers with largest element n.

8, 0, 8, 0, 8, 0, 244, 0, 1301, 288, 95, 58, 146, 20, 7089, 331, 571, 172, 25150, 100, 67678, 4036, 3850, 4522, 182152, 3784, 140446, 9592, 32890, 18634, 646954, 14014, 126562, 29788, 93394, 57742, 1655200, 8008, 3102319, 253594, 261118, 505219

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OFFSET

23,1

LINKS

Alois P. Heinz, Table of n, a(n) for n = 23..200

EXAMPLE

a(23) = 8 because there are 8 ordered 10-tuples of distinct pairwise coprime positive integers with largest element 23: (1,2,3,5,7,11,13,17,19,23), (1,2,5,7,9,11,13,17,19,23), (1,3,4,5,7,11,13,17,19,23), (1,3,5,7,8,11,13,17,19,23), (1,3,5,7,11,13,16,17,19,23), (1,4,5,7,9,11,13,17,19,23), (1,5,7,8,9,11,13,17,19,23), (1,5,7,9,11,13,16,17,19,23).

CROSSREFS

Column 10 of triangle A186972. First differences of A186986.

Sequence in context: A003131 A010679 A347157 * A347159 A156744 A228438

Adjacent sequences: A186978 A186979 A186980 * A186982 A186983 A186984

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Mar 02 2011

STATUS

approved