Message #516

From: David Smith <djs314djs314@yahoo.com>
Subject: Re: [MC4D] Re: Magic120Cell Realized
Date: Thu, 15 May 2008 17:48:56 -0700

Hi David,

Thanks for letting me know about bc! I actually already had two
Computer Algebra Systems on my computer (GAP and MuPad, which
is commercial!) but I couldn’t get either of them to display the entire number,
let me copy the number, write the number to a file, or even print the
number!

I later downloaded Yacas, which is an excellent Computer Algebra System
that naturally supports Windows. I used it to check the number, because
for a while I thought it might have been incorrect, but it turned out that
only the number of digits listed on Roice’s page was incorrect. It is now
fixed, and I have updated the paper, which is on Roice’s main page.

Sorry I didn’t respond earlier; my internet connection was down. Once again,
thanks!

Best Regards,

David

David Barr <david20708@gmail.com> wrote:
On Tue, May 6, 2008 at 10:24 PM, David Smith <djs314djs314@yahoo.com> wrote:
> To answer Roice’s question, I did find an arbitrary-precision
> calculator (Googol+, trial version) that displays the entire
> number in its full glory:
>
> 23435018363697222779126210606140343600982219866708667227704291465940007
> 37743198001537086016413748065359228217622633869330769129523601891497799
> 90823414733250819032377663096727895392891107724676361939174468537213471

The Unix program "bc" can also compute this value:

bc << EOF
define f (x) {
if (x <= 1) return (1);
return (f(x-1) * x);
}
(f(600)/2)*(f(1200)/2)*(f(720)/2)*((2^720)/2)*((6^1200)/2)*((12^600)/3)
EOF

A Windows version of "bc" is available with Cygwin (www.cygwin.com).