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 A030283 a(0) = 0; for n>0, a(n) is the smallest number greater than a(n-1) which does not use any digit used by a(n-1). 16
 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 22, 30, 41, 50, 61, 70, 81, 90, 111, 200, 311, 400, 511, 600, 711, 800, 911, 2000, 3111, 4000, 5111, 6000, 7111, 8000, 9111, 20000, 31111, 40000, 51111, 60000, 71111, 80000, 91111, 200000, 311111, 400000, 511111, 600000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS The sequence is infinite. LINKS Reinhard Zumkeller, Table of n, a(n) for n = 0..5000 MATHEMATICA a = {0}; For[n = 1, n < 1000000, n++, If[Length[Intersection[IntegerDigits[n], IntegerDigits[a[[ -1]]]]] == 0, AppendTo[a, n]]]; a (* Stefan Steinerberger, May 30 2007 *) PROG (Haskell) a030283 n = a030283_list !! n a030283_list = 0 : f 1 9 0 where    f u v w = w' : f u' v' w' where      w' = until (> w) ((+ v) . (* 10)) u      (u', v') = h u v      h 1 0 = (2, 2); h 9 0 = (1, 1); h 9 1 = (2, 0); h 9 9 = (1, 0)      h u 2 = (u+1, 0); h u v = (u+1, 1-v) -- Reinhard Zumkeller, May 03 2012 CROSSREFS Cf. A068860, A068861. Cf. A030283, A229363, A229364. Sequence in context: A132271 A116069 A081511 * A276633 A179310 A114806 Adjacent sequences:  A030280 A030281 A030282 * A030284 A030285 A030286 KEYWORD nonn,base,nice AUTHOR EXTENSIONS Edited by N. J. A. Sloane at the suggestion of Rick L. Shepherd, Sep 27 2007 Definition clarified by Harvey P. Dale, Oct 19 2012 STATUS approved

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