A152168 Number of binary digits in (n!)!.

1, 1, 2, 10, 80, 661, 5802, 54725, 558704, 6178565, 73840164, 950331113, 13121175977, 193618002604, 3042570732326, 50747501675076, 895651186352884, 16679929313440954, 326936145826028780, 6728526339596831313, 145085354333183129464, 3271200076443827203823

Offset

0,3

Links

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

Index entries for sequences related to factorial numbers

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, A072831.

Sequence in context: A100248 A368951 A108486 * A003578 A274276 A152600

Adjacent sequences: A152165 A152166 A152167 * A152169 A152170 A152171

Keyword

base,nonn

Author

Jon E. Schoenfield, Nov 27 2008

Status

approved