This is the basis for a range of “party tricks” where you challenge the straight man to give you a 3 digit number, and you’ll multiply it in your head by 7, then 11, then 13 and write the number on a hidden card. So you do that then give the straight man a calculator and get them to work through the calculation, slowly and painfully. Write down the intermediate results, and ham it up a bit, then reveal your written down answer, which is correct. With luck, the audience have forgotten the original 3-digit number.
There are a number of extensions to this game, but none with such conveniently manageable primes involved.
I only subscribe to comments, not to Jerry’s posts that I track via RSS. I guess I’m not counted as a subscriber, even if I read nearly every post here?
It was 101, and I remember my elementary teacher lecturing us that “one hundred and one” was bad English. She told us the proper way to say it was “one hundred one.”
21 Comments
Wuffly.
It is an even 1000 as I speak. You should be able to get this just with people in the building?
Prime factors of 1001 :
7 11 13
Prime factors tree :
1001
/ \
7 143
/ \
11 13
/ \
13 1
Source :
http://www.2dtx.com/prime/prime1001.html
And of course :
1001 binary = 9 decimal
Why is Christmas like Halloween?
Because Dec 25 = Oct 31.
Cannot be unread!
Bravo!
I heard that before as why do software engineers confuse Christmas with Halloween??
Good one! π
Fairly easy to work out the 11 on the grounds that 1001 is 10^3 + 1^3 which factors to
(10+1)(10^2-10+1)
This is the basis for a range of “party tricks” where you challenge the straight man to give you a 3 digit number, and you’ll multiply it in your head by 7, then 11, then 13 and write the number on a hidden card. So you do that then give the straight man a calculator and get them to work through the calculation, slowly and painfully. Write down the intermediate results, and ham it up a bit, then reveal your written down answer, which is correct. With luck, the audience have forgotten the original 3-digit number.
There are a number of extensions to this game, but none with such conveniently manageable primes involved.
1001 is the federal false-statement statute (18 USC section 1001). We’ll be hearing that number a lot w/r/t Team Trump in the coming months.
Statute eh. More like a life’s work.
How about a country by country breakdown when you get there.
How does one find out if one is a subscriber?
I think I am, but I’m not 100% sure.
If you get an email for each post, you’re a subscriber.
I get occasional e-mails, but not for each post. Does that make me a non-subscriber or not-yet subscriber?
If so I’ ll make it just 1000 to go.
There is also an option to group the mails into a daily “digest” mailing, IIRC.
I only subscribe to comments, not to Jerry’s posts that I track via RSS. I guess I’m not counted as a subscriber, even if I read nearly every post here?
Oh, I didn’t notice who I replied to. Then of course I would’ve written “your posts”. π
It was 101, and I remember my elementary teacher lecturing us that “one hundred and one” was bad English. She told us the proper way to say it was “one hundred one.”
Better 101 dalmatians than 99 luftbalons.
… um, aren’t Dalmatians d*gs?! π