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 #7 May 01 2019 16:19:03
%S 1,1,1,11,11,1111,101101,100111011,100111011,101100010011,
%T 11011101011111,100110000100010101,1110010001100111111
%N Trailing zeros removed from n! in binary.
%H Robert Israel, <a href="/A140105/b140105.txt">Table of n, a(n) for n = 0..192</a>
%F a(n) = A007088(A049606(n)). - _Robert Israel_, May 01 2019
%e a(3)=11 because 3! in binary is 110, which is 11 when the zero is removed.
%p seq(convert(n!/2^padic:-ordp(n!,2),binary), n=0..30); # _Robert Israel_, May 01 2019
%Y Cf. A007088, A049606.
%K nonn
%O 0,4
%A _Ben Branman_, Jun 03 2008