OFFSET
1,1
EXAMPLE
a(1) = 10 = 4 + 6 = 2 * 5.
a(2) = 15 = 6 + 9 = 3 * 5.
a(3) = 25 = 6 + 9 + 10 = 5^2.
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Jonathan Vos Post, Dec 21 2007
EXTENSIONS
More terms from R. J. Mathar, Jan 13 2008
STATUS
approved