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Overflow calculating the last 10, 000 digits of (((96717311574016^16777216^4)^8^4)^7)^2

Mark Raygorodsky
Posted 2 months ago

why is 96717311574016^8^16 the biggest number it can compute and any number larger than that overflows?
I was discussing the first 4000 digits of my expression (((96717311574016^16777216^4)^8^4)^7)^2 * 7^11. Because this expression is greater than 96717311574016^8^16 and it is going to overflow, can someone help me how to calculate the LAST ten thousand, or even MILLION digits of this expression. Do I calculate the mod of this expression?
Can I even calculate the mod if its just going to overflow?
POSTED BY: Mark Raygorodsky
23 Replies
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syntax error: Log10 [96717311574016] * can't be followed by [16777216^7 * 8^2].
POSTED BY: Mark Raygorodsky

is there a way to find out what the first 50, 000 digits of GRAHAM'S NUMBER are?

POSTED BY: Mark Raygorodsky

Some relevant tools for Implementation of level-index arithmetic for very large numbers were proto-typed by Swastik Banerjee (formerly at Wolfram Research).
POSTED BY: Paul Abbott
Hans Milton
Hans Milton
Posted 2 months ago

Deleted. My post was a mistake. By routine habit I considered exponentiation. While Swastik's idea involves tetration.
POSTED BY: Hans Milton

I am going to set the mantissa of this code to a MILLION digits. It’s basically 5, followed by a decimal point, followed by a million digits after that. Every method I tried to compute the first million digits of my number results in an overflow error. I don’t get the same error when computing the last million digits. To me the first and last million digits is the same size of the number and they both shouldn’t overflow. That “100” you wrote in your code should be at least 50, 000. I copied and pasted your code into my notebook and set the number to 10, 000. And I get an error “precision depth exceeded.”
POSTED BY: Mark Raygorodsky

its like it has an end but NO BEGINNING! I don't remember how to use logarithms. Do they give me info about the first digits, lets say a million?
POSTED BY: Mark Raygorodsky

For the last digits I use the mod function, but still haven't figured out how to calculate the FIRST digits! a log of a number shows how long the number is. Does it also calculate the first digits?!
POSTED BY: Mark Raygorodsky

I haven't found a way to get the first digits of my number and it's so EXTREMELY HARD that I must as well forget about them and focus on the last digits. I typed my expression in and it gave me something mod^2 power, 1977326743 followed by a million zeros and these ARE NOT THE LAST MILLION DECIMAL DIGITS I AM EXPECTING!
POSTED BY: Mark Raygorodsky
Bill Nelson
Bill Nelson
Posted 2 months ago

23 minutes ago I posted showing how you could probably get some correct leading digits.

Changing the subject. If you type something in and it doesn't work then posting that you typed something in and it didn't work does not give anyone the information they need to be able to help you. That is because your screen is turned just a bit and everyone here can't quite read your screen to see what you did.

And Mathematica keeps a hidden cache of values you have previously assigned to variables. If you don't know this then you can often get things you don't expect because you didn't realize what you had already assigned to variables. You can try restarting Mathematica and that will usually clear the cache.

If that doesn't work then scraping off your screen and pasting that into a message asking for help will usually help. But you need to carefully look at that and make certain that the posting process didn't mangle and change what you pasted into your message.
POSTED BY: Bill Nelson

I calculate the last digits by using mod 10^50000 something. How do I calculate the FIRST 50, 000 digits of my expression (96717311574016^16777216^4)^8^4)^7)^2 * 7^11
POSTED BY: Mark Raygorodsky
Bill Nelson
Bill Nelson
Posted 2 months ago
POSTED BY: Bill Nelson

my notebook is 193 KB, and I bought it directly from Mathematica. I dont remember saving it into this computer. I found on the introductory five minutes.nb then I clicked on it and it went into my notes. I made it because when I type in my expression in, it gives me "cell contents are too large for direct browser rendering. Try rendering your browser anyway or download this notebook for full functionality." I click on it in my notes but I can't open it, I just get duplicates of it. How can I type my expression in when I can't even open it?!?
POSTED BY: Mark Raygorodsky
Bill Nelson
Bill Nelson
Posted 2 months ago
POSTED BY: Bill Nelson
POSTED BY: Mark Raygorodsky
Bill Nelson
Bill Nelson
Posted 2 months ago
POSTED BY: Bill Nelson

the notebook five minutes.nb is in my notes but i cant open it; clicking it just duplicates it in my notes
POSTED BY: Mark Raygorodsky

I now have it on my computer but I am still clueless how to use the language.

POSTED BY: Mark Raygorodsky
Bill Nelson
Bill Nelson
Posted 2 months ago

Try working through Mathematica fast intro for math students

Then look at some of the other introductory material available on the web.

Or if you are very very old school then there are many good books printed on paper to help you.

For the specific errors that you saw when you tried to type in the example that I showed you, you cannot insert spaces in the middle of things, Mathematica is INTENSELY case sensitive so you cannot use lower case letters when I showed upper case letters, you cannot substitute ( for [ or ) for ] because those mean completely different things to Mathematica.

Perhaps, if you can, scrape my example off the screen and paste that into the Mathematica screen and see if that works.
POSTED BY: Bill Nelson

it gives me syntax error: ( can't be followed by mod (power mod(96717311574016, 16777216^4 * 8^4 * 7 * 2, 10^(10^6)) * 7^11, 10^(10^6))
POSTED BY: Mark Raygorodsky

thanks so much bill! so now my question is how to I calculate the last MILLION digits of my expression (((96717311574016^16777216^4)^8^4)^7)^2 * 7^11? I am basically asking to calculate mod 10^1, 000, 000 of 96717311574016^(16777216^4 * 8^4 * 7 * 2) * 7^11. but first I need to know how to use Mathematica on my computer.
POSTED BY: Mark Raygorodsky
Bill Nelson
Bill Nelson
Posted 2 months ago
POSTED BY: Bill Nelson
Hans Milton
Hans Milton
Posted 2 months ago

but first I need to know how to use Mathematica on my computer

You could download and install a free 15-day trial version: Mathematica trial
POSTED BY: Hans Milton
Bill Nelson
Bill Nelson
Posted 2 months ago

I think that 

(((96717311574016^16777216^4)^8^4)^7)^2==96717311574016^(16777216^4*8^4*7*2)

You must check that and convince yourself whether that is correct or not. As you have seen, Mathematica cannot simply directly calculate both those values and compare them for equality.

If that is correct then

Mod[PowerMod[96717311574016,16777216^4*8^4*7*2,10^(10^4)]*7^11,10^(10^4)]

returns the last 10 thousand digits of the result in a few seconds.

Study all the details of the documentation for PowerMod carefully and then find at least three completely different ways that you can try to check whether I have made any mistake or if the result might be incorrect.
POSTED BY: Bill Nelson
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