A043520 Numbers having four 7's in base 10.

7777, 17777, 27777, 37777, 47777, 57777, 67777, 70777, 71777, 72777, 73777, 74777, 75777, 76777, 77077, 77177, 77277, 77377, 77477, 77577, 77677, 77707, 77717, 77727, 77737, 77747, 77757, 77767, 77770, 77771, 77772

Offset: 1

Author

Clark Kimberling

Keywords

• nonn
• base

Links

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

Crossrefs

Subsequence of A011537.