OFFSET
1,2
COMMENTS
Also the ranks of (even i)+(even j)/r, when all i+j/r are ranked, because 1/r = r-1. Complement of A184333.
EXAMPLE
Writing (i,j) for i+r*j, the first 7 in the ranking are
(0,0), (1,0), (0,1), (2,0), (1,1), (3,0), (0,2);
the ranks where both i and j are even are a(1)=1, a(2)=4,
a(3)=7.
CROSSREFS
KEYWORD
nonn
AUTHOR
Clark Kimberling, Jan 08 2011
STATUS
approved