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 A111708 a(n) = n concatenated with 9's complement of n. 2
 9, 18, 27, 36, 45, 54, 63, 72, 81, 90, 1089, 1188, 1287, 1386, 1485, 1584, 1683, 1782, 1881, 1980, 2079, 2178, 2277, 2376, 2475, 2574, 2673, 2772, 2871, 2970, 3069, 3168, 3267, 3366, 3465, 3564, 3663, 3762, 3861, 3960, 4059, 4158, 4257, 4356, 4455, 4554 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS If n has k digits a(n) is a multiple of 10^k -1. The sequence contains 10^(k) multiples of 10^k -1. a(n)/{10^k -1} gives all natural numbers. All terms are multiples of 9: A007953(a(n))=9*A055642(n); A010888(a(n))=9. - Reinhard Zumkeller, Sep 17 2015 LINKS Reinhard Zumkeller, Table of n, a(n) for n = 0..9999 EXAMPLE a(90) = 9009. PROG (Haskell) a111708 0 = 9 a111708 n = f [] n where    f ys 0 = foldl (\v d -> 10 * v + d) 0 \$ ys ++ map (9 -) ys    f ys x = f (d : ys) x' where (x', d) = divMod x 10 -- Reinhard Zumkeller, Sep 17 2015 CROSSREFS Cf. A061601, A010888, A007953, A055642, subsequence of A262277. Sequence in context: A070793 A052223 A085132 * A248050 A044052 A131418 Adjacent sequences:  A111705 A111706 A111707 * A111709 A111710 A111711 KEYWORD base,easy,nonn AUTHOR Amarnath Murthy, Aug 22 2005 EXTENSIONS More terms from Joshua Zucker, May 08 2006 Definition cleared and offset changed by Reinhard Zumkeller, Sep 17 2015 STATUS approved

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Last modified September 21 23:10 EDT 2020. Contains 337274 sequences. (Running on oeis4.)