|
|
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
(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
|
|
|
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
|
|
|
|