A043500 Numbers having four 2's in base 10.

2222, 12222, 20222, 21222, 22022, 22122, 22202, 22212, 22220, 22221, 22223, 22224, 22225, 22226, 22227, 22228, 22229, 22232, 22242, 22252, 22262, 22272, 22282, 22292, 22322, 22422, 22522, 22622, 22722, 22822, 22922

Offset: 1

Author

Clark Kimberling

Keywords

• nonn
• base

Links

• Daniel Starodubtsev, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A043496.

Programs

Mathematica

Select[Range[2222,30000],DigitCount[#,10,2]==4&] (* Harvey P. Dale, Oct 05 2012 *)