

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
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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:


MATHEMATICA

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


CROSSREFS



KEYWORD

base,nonn


AUTHOR



STATUS

approved



