A125059 - OEIS

This site is supported by donations to The OEIS Foundation.

A125059

Number of digits in n!!.

1, 1, 1, 1, 2, 2, 3, 3, 3, 4, 5, 5, 6, 6, 7, 8, 8, 9, 9, 10, 11, 11, 12, 13, 13, 14, 15, 16, 16, 17, 18, 19, 19, 20, 21, 22, 22, 23, 24, 25, 26, 27, 27, 28, 29, 30, 31, 32, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,5`
	EXAMPLE	`a(5)=2 because 5!! = 531 = 15`
	MAPLE	`SFACT:= proc(n) local i, j, k; for k from 1 by 1 to n do i:=k; j:=k-2; while j >0 do i:=i*j; j:=j-2; od: j:=0; while i>0 do i:=trunc(i/10); j:=j+1; od; print(j) od; end: SFACT(100);`
	CROSSREFS	`Cf. A034886.` `Sequence in context: A115384 A131411 A194202 * A029112 A029094 A003105` `Adjacent sequences: A125056 A125057 A125058 * A125060 A125061 A125062`
	KEYWORD	`easy,nonn,base`
	AUTHOR	`Paolo P. Lava & Giorgio Balzarotti (paoloplava(AT)gmail.com), Jan 08 2007`

Content is available under The OEIS End-User License Agreement .

Last modified February 14 23:53 EST 2012. Contains 205689 sequences.