OFFSET
1,1
LINKS
Colin Barker, Table of n, a(n) for n = 1..750
EXAMPLE
11 is in the sequence because the only solution to x^2 + 4xy + y^2 = 121 with 0 < x < y is (x,y) = (4,5).
CROSSREFS
KEYWORD
nonn
AUTHOR
Colin Barker, Jan 21 2015
STATUS
approved