# 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).