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Re: Four 4s

Posted: Wed Jun 17, 2009 10:21 pm
by James Hall
Neil Zussman wrote:Also, is my way of making 3 from two 4's by using infinitely many square roots (posted earlier) legal?
Normally you're only allowed a finite number of functions.

Kai, the gamma function, as far as integers are concerned, is defined thus:
Γ(n) = (n-1)!

Re: Four 4s

Posted: Fri Jun 19, 2009 5:33 pm
by Neil Zussman
Presumably Kai means we can use double factorial. Thus 4!!=8 and ((4!!)!!)/4=96.
This means 3=4!/4!!, i.e. 3 can be made using just two 4's. Thus 51, 45, 93 and 99 can now be made (see my previous post). I'm sure lots more numbers can be made as well, although interest in the puzzle seems to have waned.

Re: Four 4s

Posted: Mon Aug 30, 2010 4:53 pm
by Robert Baxter
33:

(4*4*sqrt 4)+sqrt 4
4!+(4!/4)+4
sqrt(4^4)*sqrt 4+sqrt 4

Edit: Told you I was an :ugeek:

Re: Four 4s

Posted: Mon Aug 30, 2010 4:57 pm
by Kai Laddiman
Robert Baxter wrote:33:

(4*4*sqrt 4)+sqrt 4
4!+(4!/4)+4
sqrt(4^4)*sqrt 4+sqrt 4

Edit: Told you I was an :ugeek:
There's only 3 there, not 33. Typo perhaps?

Re: Four 4s

Posted: Mon Aug 30, 2010 5:11 pm
by Robert Baxter
Kai Laddiman wrote:
Robert Baxter wrote:33:

(4*4*sqrt 4)+sqrt 4
*4!+(4!/4)+4
sqrt(4^4)*sqrt 4+sqrt 4

Edit: Told you I was an :ugeek:
There's only 3 there, not 33. Typo perhaps?
Does this work?