Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #23 Apr 23 2020 04:23:11
%S 1,11,101,111,1001,1011,1101,1111,10001,10011,10101,10111,11001,11011,
%T 11101,11111,100001,100011,100101,100111,101001,101011,101101,101111,
%U 110001,110011,110101,110111,111001,111011,111101,111111,1000001
%N Odd positive integers in base 2 (bisection of A007088).
%C List of binary vectors that begin and end with 1.
%H N. J. A. Sloane, <a href="/A099821/b099821.txt">Table of n, a(n) for n = 1..1000</a>
%H <a href="/index/Ar#2-automatic">Index entries for 2-automatic sequences</a>.
%p seq(convert(2*n-1,binary),n=1..37); # _Emeric Deutsch_, Dec 15 2004
%t FromDigits/@IntegerDigits[Range[1,71,2],2] (* _Harvey P. Dale_, Apr 05 2019 *)
%o (PARI) a(n) = fromdigits(binary(2*n-1), 10); \\ _Michel Marcus_, Apr 23 2020
%Y Cf. A007088, A099820.
%K nonn,base,easy
%O 1,2
%A _N. J. A. Sloane_, Nov 19 2004
%E More terms from _Emeric Deutsch_, Dec 15 2004