OFFSET
1,1
COMMENTS
EXAMPLE
n=61, swap 6 and 1 to get 16=4^2
n=211, swap 2 and 1 to get 121=11^2
n=619, swap 6 and 1 to get 169=13^2.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Zak Seidov, Dec 12 2009
STATUS
approved