OFFSET
1,3
COMMENTS
See Ionascu (2015) for precise definition.
Numbers of the form a^2 + b^2 -2*GCD(a,b) + 1 with a,b not both 0. - Ray Chandler, Mar 21 2016
LINKS
Ray Chandler, Table of n, a(n) for n = 1..10000
E. J. Ionascu, Ehrhart polynomial for lattice squares, cubes and hypercubes, arXiv preprint arXiv:1508.03643, 2015
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Mar 16 2016
STATUS
approved