A291346 a(n) = numbers that contain exactly four digits: three identical digits and another different digit.

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

Harvey P. Dale, Table of n, a(n) for n = 1..324

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

Adjacent sequences: A291343 A291344 A291345 * A291347 A291348 A291349

Keyword

nonn,base,fini

Author

Enrique Navarrete, Aug 22 2017

Status

approved