OFFSET
1,1
COMMENTS
Positive integers n such that A120744(n) = -1.
LINKS
Eric Weisstein's World of Mathematics, Centered Polygonal Number.
CROSSREFS
KEYWORD
nonn
AUTHOR
Alexander Adamchuk, Oct 10 2009
EXTENSIONS
Edited and extended by Max Alekseyev, Jan 20 2010
STATUS
approved