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 A120005 Smallest number containing exactly n distinct numbers in its decimal representation. 2
 0, 11, 10, 100, 102, 120, 1012, 1023, 1120, 1230, 10123, 10234, 11203, 11230, 12340, 101234, 102345, 111230, 112130, 112340, 123450, 1012345, 1023456, 1112130, 1112340, 1121340, 1123450, 1234560 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS A000030(a(n)) = 1 for n > 1; A120004(a(n)) = n and A120004(m) < n for m < a(n). LINKS EXAMPLE Illustration of initial values: .   n |   a(n) ... and n-1 proper substrings . ----+---------------------------------------------------- .   1 |     0 .   2 |    11    1 .   3 |    10    1    0 .   4 |   100   10    1   0 .   5 |   102   10    2   1   0 .   6 |   120   20   12   2   1   0 .   7 |  1012  101   12  10   2   1  0 .   8 |  1023  102   23  10   3   2  1  0 .   9 |  1120  120  112  20  12  11  2  1  0 .  10 |  1230  230  123  30  23  12  3  2  1  0 .  11 | 10123 1012  123 101  23  12 10  3  2  1 0 .  12 | 10234 1023  234 102  34  23 10  4  3  2 1 0 .  13 | 11203 1203 1120 203 120 112 20 12 11  3 2 1 0 .  14 | 11230 1230 1123 230 123 112 30 23 12 11 3 2 1 0 .  15 | 12340 2340 1234 340 234 123 40 34 23 12 4 3 2 1 0 . PROG (Haskell) import Data.List (isInfixOf, elemIndex) import Data.Maybe (fromJust) a120005 = fromJust . (`elemIndex` a120004_list) -- Reinhard Zumkeller, Jul 16 2012 CROSSREFS Sequence in context: A061882 A323296 A275782 * A105026 A077326 A106411 Adjacent sequences:  A120002 A120003 A120004 * A120006 A120007 A120008 KEYWORD nonn,base AUTHOR Reinhard Zumkeller, Jun 15 2006 EXTENSIONS a(1) changed from 1 to 0 by Zak Seidov, May 30 2010. STATUS approved

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Last modified September 20 01:54 EDT 2020. Contains 337260 sequences. (Running on oeis4.)