A152168 - OEIS

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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

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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.