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A115853 Numbers where every digit that is present occurs more than once (not necessarily consecutively). 4
11, 22, 33, 44, 55, 66, 77, 88, 99, 111, 222, 333, 444, 555, 666, 777, 888, 999, 1001, 1010, 1100, 1111, 1122, 1133, 1144, 1155, 1166, 1177, 1188, 1199, 1212, 1221, 1313, 1331, 1414, 1441, 1515, 1551, 1616, 1661, 1717, 1771, 1818, 1881, 1919, 1991, 2002 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Through terms shown, this is also numbers where every digit present occurs the same number of times (not necessarily consecutively). The first number in this sequence not in that one is 10001.

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

MAPLE

filter:= proc(n)

local L, S;

L:= convert(n, base, 10);

S:= convert(L, set);

min(seq(numboccur(i, L), i=S)) > 1

end proc:

select(filter, [$1..10000]); # Robert Israel, May 28 2014

MATHEMATICA

edQ[n_]:=Min[Select[DigitCount[n], #!=0&]]>1; Select[Range[2100], edQ] (* Harvey P. Dale, Dec 13 2018 *)

CROSSREFS

Cf. A033023, A014181.

Sequence in context: A226467 A244394 A299792 * A050785 A239019 A033023

Adjacent sequences:  A115850 A115851 A115852 * A115854 A115855 A115856

KEYWORD

base,nonn

AUTHOR

Franklin T. Adams-Watters, Mar 13 2006

STATUS

approved

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Last modified March 28 11:49 EDT 2020. Contains 333083 sequences. (Running on oeis4.)