OFFSET
1,2
LINKS
Eric Weisstein's World of Mathematics, Kaprekar Number
Wikipedia, Kaprekar number
FORMULA
a(n) = sqrt(A102766(n)).
PROG
(Haskell)
a248353 n = a248353_list !! (n-1)
a248353_list = filter k [1..] where
k x = elem x $ map (uncurry (+)) $
takeWhile ((> 0) . fst) $ map (divMod (x ^ 2)) a011557_list
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Oct 05 2014
STATUS
approved