mersenneforum.org  

Go Back   mersenneforum.org > Prime Search Projects > Prime Gap Searches

Reply
 
Thread Tools
Old 2021-06-01, 14:05   #12
Viliam Furik
 
"Viliam Furík"
Jul 2018
Martin, Slovakia

23·5·17 Posts
Default

Quote:
Originally Posted by xilman View Post
I'd like to see you walk from the Earth to the Moon.
Note the usage of words - "walking distance".
Viliam Furik is offline   Reply With Quote
Old 2021-06-01, 14:17   #13
LaurV
Romulan Interpreter
 
LaurV's Avatar
 
Jun 2011
Thailand

230608 Posts
Default

Quote:
Originally Posted by xilman View Post
I'd like to see you walk from the Earth to the Moon.
Give me the time...

Last fiddled with by LaurV on 2021-06-01 at 14:18
LaurV is offline   Reply With Quote
Old 2021-06-03, 17:23   #14
Bobby Jacobs
 
Bobby Jacobs's Avatar
 
May 2018

233 Posts
Default

Quote:
Originally Posted by a1call View Post
Light travels 0.3 Micrometers (1/1000 of a millimeter) in 1 femtosecond.
Light will travel more than 18446 Light-Years in 2^64 femtoseconds. This is more than 4000 times the distance to the closest stars to our sun.
Actually, light travels about 18446 light-seconds in 264 femtoseconds. That is less than a light-year.
Bobby Jacobs is offline   Reply With Quote
Old 2021-06-03, 20:59   #15
a1call
 
a1call's Avatar
 
"Rashid Naimi"
Oct 2015
Remote to Here/There

1000010111012 Posts
Default

Thank you very much for the correction


Code:
2^64*0.3 micrometers = 5534023222112865484.8 micrometers = 5534023222112.8654848 m = 5534023222.1128654848 km = 0.00058493005201488906931613994292358101681 ly
a1call is offline   Reply With Quote
Old 2021-06-03, 22:55   #16
a1call
 
a1call's Avatar
 
"Rashid Naimi"
Oct 2015
Remote to Here/There

2,141 Posts
Default

Quote:
The "back half of the chessboard" is a reference to the old story about the inventor of chess. As the story goes, when chess was presented to a great king, the king offered the inventor any reward that he wanted. The inventor asked that a single grain of rice be placed on the first square of the chessboard. Then two grains on the second square, four grains on the third, and so on. Doubling each time.

The king, baffled by such a small price for a wonderful game, immediately agreed, and ordered the treasurer to pay the agreed upon sum. A week later, the inventor went before the king and asked why he had not received his reward. The king, outraged that the treasurer had disobeyed him, immediately summoned him and demanded to know why the inventor had not been paid. The treasurer explained that the sum could not be paid - by the time you got even halfway through the chessboard, the amount of grain required was more than the entire kingdom possessed.

The king took in this information and thought for a while. Then he did the only rational thing a king could do in those circumstances. He had the inventor killed, as an object lesson in the perils of trying to outwit the king.
https://www.forbes.com/sites/alexkna...nential-curve/

Last fiddled with by retina on 2021-06-03 at 22:58 Reason: Remove tracking code fron URL. You can do this yourself.
a1call is offline   Reply With Quote
Old 2021-06-05, 06:54   #17
robert44444uk
 
robert44444uk's Avatar
 
Jun 2003
Oxford, UK

36458 Posts
Default

Quote:
Originally Posted by LaurV View Post
Give me the time...
I feel confident that there are people who do the distance in a lifetime. But probably not most specimens of homo sapiens species.

People are encouraged to do 10,000 steps a day in the UK, and an average step is about 70 cm. Allowing for pre toddler days and bedridden days at the far end, a good mobile life (say the top 10%-15% of the population) is 85 years in G20 countries.

So a first approximation:

85*365.25*10000*0.7/1000 = 217,300 km in a lifetime

The moon is Km 356,500 closest distance from the earth centre to centre, or approx. 348,400 km surface to surface.

There will be fit pastoralists in Africa who achieve this, I am sure. Not so sure about us car-obsessed people in the G20. Some will though.

Last fiddled with by robert44444uk on 2021-06-05 at 06:55
robert44444uk is offline   Reply With Quote
Old 2021-06-07, 19:49   #18
Bobby Jacobs
 
Bobby Jacobs's Avatar
 
May 2018

233 Posts
Default

I recall the story of the grains of rice. The first square on the chessboard had 1 grain of rice, the second square had 2 grains, the third square had 4 grains, ..., the last square had 263=9223372036854775808 grains. In all, there were 264-1=18446744073709551615 grains of rice. That might seem like a lot of rice, but there are more atoms in a single grain of rice than the number of grains of rice in that story.
Bobby Jacobs is offline   Reply With Quote
Old 2021-06-07, 20:05   #19
chalsall
If I May
 
chalsall's Avatar
 
"Chris Halsall"
Sep 2002
Barbados

23·17·73 Posts
Default

Quote:
Originally Posted by Bobby Jacobs View Post
...but there are more atoms in a single grain of rice than the number of grains of rice in that story.
There are more possible positions in the game of Go than there are atoms in the Universe.

That's why AlphaGo was so impressive. And scary (for those who like humans).
chalsall is online now   Reply With Quote
Reply

Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Finding multiples of a real number that are close to a whole number mickfrancis Math 16 2017-03-01 07:17
Estimating the number of primes in a partially-factored number CRGreathouse Probability & Probabilistic Number Theory 15 2014-08-13 18:46
Number of distinct prime factors of a Double Mersenne number aketilander Operazione Doppi Mersennes 1 2012-11-09 21:16
Estimating the number of prime factors a number has henryzz Math 7 2012-05-23 01:13
Fermat number F6=18446744073709551617 is a composite number. Proof. literka Factoring 5 2012-01-30 12:28

All times are UTC. The time now is 02:57.


Sun Oct 17 02:57:20 UTC 2021 up 85 days, 21:26, 0 users, load averages: 0.62, 1.39, 2.06

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.

This forum has received and complied with 0 (zero) government requests for information.

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation.
A copy of the license is included in the FAQ.