A043519 Numbers having three 7's in base 10.

777, 1777, 2777, 3777, 4777, 5777, 6777, 7077, 7177, 7277, 7377, 7477, 7577, 7677, 7707, 7717, 7727, 7737, 7747, 7757, 7767, 7770, 7771, 7772, 7773, 7774, 7775, 7776, 7778, 7779, 7787, 7797, 7877, 7977, 8777, 9777, 10777

Offset: 1

Author

Clark Kimberling

Keywords

• nonn
• base

Links

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

Crossrefs

Subsequence of A011537.

Programs

Mathematica

Select[Range[11000],DigitCount[#,10,7]==3&] (* Harvey P. Dale, Mar 25 2015 *)