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, 98, 99, 100, 101

Offset

1,2

Links

Table of n, a(n) for n=1..67.

Mathematica

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

Crossrefs

Cf. A007094.

Sequence in context: A039111 A037475 A354047 * A047422 A340152 A160532

Adjacent sequences: A031484 A031485 A031486 * A031488 A031489 A031490

Keyword

nonn,base

Author

Clark Kimberling

Extensions

a(64)-a(67) from Pontus von Brömssen, Mar 17 2026

Status

approved