login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A152168 Number of binary digits in (n!)!. 2
1, 1, 2, 10, 80, 661, 5802, 54725, 558704, 6178565, 73840164, 950331113, 13121175977, 193618002604, 3042570732326, 50747501675076, 895651186352884, 16679929313440954, 326936145826028780, 6728526339596831313 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Jon E. Schoenfield, Table of n, a(n) for n = 0..30

EXAMPLE

(3!)! = 6! = 720 has ten binary digits (1011010000), so a(3) = 10.

PROG

(PARI) a(n) = length(binary(n!!)) \\ Michel Marcus, Jun 02 2013

CROSSREFS

Cf. A000197.

Sequence in context: A245903 A100248 A108486 * A003578 A274276 A152600

Adjacent sequences:  A152165 A152166 A152167 * A152169 A152170 A152171

KEYWORD

base,nonn

AUTHOR

Jon E. Schoenfield, Nov 27 2008

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 17 20:36 EST 2020. Contains 330987 sequences. (Running on oeis4.)