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A115853
Numbers where every digit that is present occurs more than once (not necessarily consecutively).
6
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
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
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
Sequence in context: A226467 A244394 A299792 * A050785 A369347 A239019
KEYWORD
base,nonn
AUTHOR
STATUS
approved