A031487 Numbers whose base-8 representation has the same number of 0's as 7's.

1, 2, 3, 4, 5, 6, 9, 10, 11, 12, 13, 14, 17, 18, 19, 20, 21, 22, 25, 26, 27, 28, 29, 30, 33, 34, 35, 36, 37, 38, 41, 42, 43, 44, 45, 46, 49, 50, 51, 52, 53, 54, 56, 71, 73, 74, 75, 76, 77, 78, 81, 82, 83, 84, 85, 86, 89, 90, 91, 92, 93, 94, 97

Offset: 1

Author

Clark Kimberling

Keywords

• nonn
• base

Crossrefs

Cf. A007094.

Programs

Mathematica

Select[Range[100],DigitCount[#,8,0]==DigitCount[#,8,7]&] (* Harvey P. Dale, Dec 12 2017 *)