cp's OEIS Frontend

A307313 a(n) is the denominator of n/2^(length of the binary representation of n).

%I A307313 #8 Apr 02 2019 19:17:59
%S A307313 2,2,4,2,8,4,8,2,16,8,16,4,16,8,16,2,32,16,32,8,32,16,32,4,32,16,32,8,
%T A307313 32,16,32,2,64,32,64,16,64,32,64,8,64,32,64,16,64,32,64,4,64,32,64,16,
%U A307313 64,32,64,8,64,32,64,16,64,32,64,2,128,64,128,32,128,64
%N A307313 a(n) is the denominator of n/2^(length of the binary representation of n).
%F A307313 a(n) = denominator(n/2^A070939(n)).
%F A307313 a(n) = denominator(n/A062383(n)).
%F A307313 a(n) = 2^A070940(n).
%e A307313 For n=1, 1 = 1_2,  a(1) = denominator(1/(2^1)) = denominator(1/2) = 2;
%e A307313 For n=2, 2 = 10_2, a(2) = denominator(2/(2^2)) = denominator(1/2) = 2;
%e A307313 For n=3, 3 = 11_2, a(3) = denominator(3/(2^2)) = denominator(3/4) = 4.
%o A307313 (PARI) a(n) = denominator(n/(2^(#binary(n))));
%Y A307313 Cf. A062383, A070939, A000265 (numerators), A078267 (analog in base 10).
%K A307313 nonn,base,frac
%O A307313 1,1
%A A307313 _Michel Marcus_, Apr 02 2019