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

Offset: 1

Author

Reinhard Zumkeller, Feb 07 2010

Keywords

• base
• nonn

Links

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

Crossrefs

Cf. A007088, A144795, A173021.

A173024 is a subsequence.

Programs

Mathematica

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

Formula

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