login
Number of ordered quintuples of distinct pairwise coprime positive integers with largest element n.
4

%I #8 Mar 30 2012 17:37:34

%S 2,1,3,0,26,1,72,9,14,29,228,15,431,55,115,75,928,70,743,205,633,225,

%T 2499,70,3571,958,1085,728,1626,350,6979,1231,2061,822,10800,450,

%U 13978,2361,2750,2772,20114,1507,15718,2761,7370,4422,33082,2457,13971

%N Number of ordered quintuples of distinct pairwise coprime positive integers with largest element n.

%H Alois P. Heinz, <a href="/A186976/b186976.txt">Table of n, a(n) for n = 7..200</a>

%e a(7) = 2 because there are 2 ordered quintuples of distinct pairwise coprime positive integers with largest element 7: (1,2,3,5,7), (1,3,4,5,7).

%Y Column 5 of triangle A186972. First differences of A015698.

%K nonn

%O 7,1

%A _Alois P. Heinz_, Mar 01 2011