login
This site is supported by donations to The OEIS Foundation.

 

Logo

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A186980 Number of ordered 9-tuples of distinct pairwise coprime positive integers with largest element n. 4
8, 0, 0, 0, 81, 1, 74, 4, 70, 6, 1056, 1, 3640, 793, 398, 247, 621, 89, 14930, 956, 1662, 513, 42243, 285, 93093, 6831, 6765, 7785, 213681, 5511, 162549, 13299, 44517, 25245, 633633, 16731, 145215, 36003, 108885, 67779, 1437252, 9867, 2406404 (list; graph; refs; listen; history; text; internal format)
OFFSET

19,1

LINKS

Alois P. Heinz, Table of n, a(n) for n = 19..200

EXAMPLE

a(24) = 1 because there is one ordered 9-tuple of distinct pairwise coprime positive integers with largest element 24: (1,5,7,11,13,17,19,23,24).

CROSSREFS

Column 9 of triangle A186972. First differences of A186985.

Sequence in context: A299165 A221890 A047758 * A171918 A265117 A279418

Adjacent sequences:  A186977 A186978 A186979 * A186981 A186982 A186983

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Mar 02 2011

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 17 05:26 EST 2019. Contains 319207 sequences. (Running on oeis4.)