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A173022 Number of numbers <= n having no isolated ones in their binary representations. 5
1, 1, 1, 2, 2, 2, 3, 4, 4, 4, 4, 4, 5, 5, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 9, 10, 10, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 13, 13, 13, 14, 14, 14, 15, 16, 17, 17, 17, 18, 19, 19, 20, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

a(A144795(n+1)) = a(A144795(n)) + 1;

a(2^n - 1)) = A005251(n+1);

A173021(n) <= a(n) <= A173023(n).

LINKS

R. Zumkeller, Table of n, a(n) for n = 0..10000

EXAMPLE

a(20)=#{0,3,6,7,12,14,15}=#{0,11,110,111,1100,1110,1111}=7.

CROSSREFS

Sequence in context: A322210 A228482 A091822 * A060973 A097915 A255072

Adjacent sequences:  A173019 A173020 A173021 * A173023 A173024 A173025

KEYWORD

base,nonn

AUTHOR

Reinhard Zumkeller, Feb 07 2010

STATUS

approved

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Last modified May 6 09:04 EDT 2021. Contains 343580 sequences. (Running on oeis4.)