A120005 - OEIS

A120005

Smallest number containing exactly n distinct numbers in its decimal representation.

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

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OFFSET

1,2

COMMENTS

A000030(a(n)) = 1 for n > 1;

A120004(a(n)) = n and A120004(m) < n for m < a(n).

LINKS

Table of n, a(n) for n=1..28.

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: A323296 A373693 A275782 * A362335 A105026 A350671

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