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Offline Hotrod216

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on: February 13, 2022, 01:46:27 PM
There is only one even number that is a prime number. What is it and what is you favorite prime number? Mine is 23.  I guess it's because that's what the volume on my TV is set to.


Offline purpleshoes

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Reply #1 on: February 14, 2022, 12:00:42 PM
Two is the only even prime number. Every other even number can be divided by two.

What are the two smallest odd numbers that are not prime?


Offline Asmodel

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Reply #2 on: February 14, 2022, 02:21:53 PM
1 and 9?

73 is the 21st prime number. Its mirror, 37, is the 12th and its mirror, 21, is the product of multiplying 7 and 3


Offline Hotrod216

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Reply #3 on: February 14, 2022, 02:23:41 PM
Quote from: purpleshoes on February 14, 2022, 12:00:42 PM
Two is the only even prime number. Every other even number can be divided by two.

What are the two smallest odd numbers that are not prime?
9 and 1


Offline Army of One

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Reply #4 on: February 16, 2022, 07:30:40 AM
Okay, I'm going to post only once to this thread, because I will flood this thread if left unchecked. So, I'll give you all two maths facts.

  • There are a whole lot of answers to the equation pair
    a + b = cd
    ab = c + d
    But only two use only positive whole numbers (no, zero is neither positive or negative). I'll let you guess at least one of them.
  • There is an equation that'll graph a trapezium on the number plane; I know this because I spent the holidays figuring it out. It's kind of long, so I won't include it here unless you ask.

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Online MintJulie

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Reply #5 on: April 29, 2022, 03:03:52 PM
AO1, working on it.




As for the OP....

My favorite prime number is 29, because, when you add the two characters together (2 & 9), it equals another prime number 11.   Same with 47 & 83.

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Offline JBRG

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Reply #6 on: April 29, 2022, 06:19:36 PM
Quote from: MintJulie on April 29, 2022, 03:03:52 PM
AO1, working on it.




As for the OP....

My favorite prime number is 29, because, when you add the two characters together (2 & 9), it equals another prime number 11.   Same with 47 & 83.

My favourite prime number is 17 simply for the fact that was the jersey number I was given when I first started playing minor hockey. I have worn it ever since (over 50 years). If I can't get 17 because somebody else already has it, I opt for a number that is a multiple (34, 51, 68, etc). Even my license plates have a multiple of 17 on them - my current plate has 3 letters followed by 34.

That is all.

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