OFFSET
10,4
EXAMPLE
a(16) = a(17) = 5, 16-11 = 22-17 = 5. a(123) = 2, 123 -121 = 2.
CROSSREFS
KEYWORD
base,easy,nonn
AUTHOR
Amarnath Murthy, Nov 28 2004
EXTENSIONS
More terms from Ray Chandler, Dec 10 2004
STATUS
approved