A099821 Odd positive integers in base 2 (bisection of A007088).

1, 11, 101, 111, 1001, 1011, 1101, 1111, 10001, 10011, 10101, 10111, 11001, 11011, 11101, 11111, 100001, 100011, 100101, 100111, 101001, 101011, 101101, 101111, 110001, 110011, 110101, 110111, 111001, 111011, 111101, 111111, 1000001

Offset: 1

Author

N. J. A. Sloane, Nov 19 2004

Keywords

• nonn
• base
• easy

Comments

List of binary vectors that begin and end with 1.

Links

• N. J. A. Sloane, Table of n, a(n) for n = 1..1000
• Index entries for 2-automatic sequences.

Crossrefs

Cf. A007088, A099820.

Programs

Maple

seq(convert(2*n-1,binary),n=1..37); # Emeric Deutsch, Dec 15 2004

Mathematica

FromDigits/@IntegerDigits[Range[1,71,2],2] (* Harvey P. Dale, Apr 05 2019 *)

PARI

a(n) = fromdigits(binary(2*n-1), 10); \\ Michel Marcus, Apr 23 2020

Extensions

More terms from Emeric Deutsch, Dec 15 2004