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A186978 Number of ordered septuples of distinct pairwise coprime positive integers with largest element n. 4
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 (list; graph; refs; listen; history; text; internal format)
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: A171916 A222118 A267333 * A228532 A019956 A212720

Adjacent sequences:  A186975 A186976 A186977 * A186979 A186980 A186981

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Mar 02 2011

STATUS

approved

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Last modified January 22 12:13 EST 2019. Contains 319363 sequences. (Running on oeis4.)