OFFSET
1,1
REFERENCES
C. A. Pickover, ``The Undulation of the Monks.'' Ch. 20 in Keys to Infinity. New York: W.H.Freeman, pp. 159-161 1995.
C. A. Pickover, "Wonders of Numbers", Oxford New York 2001, Chapter 52, pp. 123-124, 316-317.
LINKS
Reinhard Zumkeller, Table of n, a(n) for n = 1..10000
C. A. Pickover, "Wonders of Numbers, Adventures in Mathematics, Mind and Meaning," Zentralblatt review
Eric Weisstein's World of Mathematics, Undulating Number
PROG
(Haskell)
import Data.Set (fromList, deleteFindMin, insert)
a046075 n = a046075_list !! (n-1)
a046075_list = f $ fromList
[100 * a + 10 * b + a | a <- [1..9], b <- [0..9], b /= a]
where f s = m : f (insert (10 * m + div (mod m 100) 10) s')
where (m, s') = deleteFindMin s
-- Reinhard Zumkeller, Apr 29 2015, May 01 2012
CROSSREFS
KEYWORD
nonn,base
AUTHOR
STATUS
approved