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A291346
a(n) = numbers that contain exactly four digits: three identical digits and another different digit.
1
1000, 1011, 1101, 1110, 1112, 1113, 1114, 1115, 1116, 1117, 1118, 1119, 1121, 1131, 1141, 1151, 1161, 1171, 1181, 1191, 1211, 1222, 1311, 1333, 1411, 1444, 1511, 1555, 1611, 1666, 1711, 1777, 1811, 1888, 1911, 1999, 2000, 2022, 2111, 2122, 2202, 2212, 2220, 2221, 2223, 2224, 2225, 2226, 2227, 2228, 2229, 2232, 2242, 2252, 2262, 2272, 2282, 2292, 2322, 2333, 2422, 2444
OFFSET
1,1
COMMENTS
The last term of the sequence is 9998.
There are 324 terms in the sequence. - Harvey P. Dale, Aug 27 2019
LINKS
MATHEMATICA
Select[Range[1000, 9999], Sort[DigitCount[#]]=={0, 0, 0, 0, 0, 0, 0, 0, 1, 3}&] (* Harvey P. Dale, Aug 27 2019 *)
CROSSREFS
Sequence in context: A213317 A281150 A069746 * A191753 A033830 A100975
KEYWORD
nonn,base,fini
AUTHOR
Enrique Navarrete, Aug 22 2017
STATUS
approved