A173025 - OEIS

A173025

Numbers whose binary representation contains no isolated digits "11".

0, 1, 2, 4, 5, 7, 8, 9, 10, 14, 15, 16, 17, 18, 20, 21, 23, 28, 29, 30, 31, 32, 33, 34, 36, 37, 39, 40, 41, 42, 46, 47, 56, 57, 58, 60, 61, 62, 63, 64, 65, 66, 68, 69, 71, 72, 73, 74, 78, 79, 80, 81, 82, 84, 85, 87, 92, 93, 94, 95, 112, 113, 114, 116, 117, 119, 120, 121, 122

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,3

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..1000

FORMULA

A173021(a(n+1)) = A173021(a(n)) + 1.

MATHEMATICA

Select[Range[0, 150], FreeQ[Split[IntegerDigits[#, 2]], {1, 1}] &] (* Paolo Xausa, Oct 15 2024 *)

CROSSREFS

Cf. A007088, A144795, A173021.

A173024 is a subsequence.