Set of little observations with prime numbers...

Discuss the language of the universe.

Moderators: Calilasseia, ADParker

Set of little observations with prime numbers...

#1  Postby LjSpike » Mar 12, 2017 12:53 pm

The final digit of all prime numbers is either: 1,2,3,5,7,9
Of those, 1 and 9 do not appear as single digit primes...
And 2 and 5 only appear as single digit primes.
Also, of the four digit primes, the final 3 digits can be any of those "final primes" listed above except 2 and 5, as long as the first digit is a 1 or a 2, with the exception of 1333.
LjSpike
THREAD STARTER
 
Posts: 89
Age: 20
Male

United Kingdom (uk)
Print view this post

Ads by Google


Re: Set of little observations with prime numbers...

#2  Postby newolder » Mar 12, 2017 1:03 pm

As of January 2017 , the largest known prime number is 274,207,281 − 1, a number with 22,338,618 digits.
I am, somehow, less interested in the weight and convolutions of Einstein’s brain than in the near certainty that people of equal talent have lived and died in cotton fields and sweatshops. - Stephen J. Gould
User avatar
newolder
 
Name: Albert Ross
Posts: 7310
Age: 1
Male

Country: Feudal Estate number 9
Print view this post

Re: Set of little observations with prime numbers...

#3  Postby LjSpike » Mar 12, 2017 4:33 pm

newolder wrote:As of January 2017 , the largest known prime number is 274,207,281 − 1, a number with 22,338,618 digits.

That's a Mersene prime if I'm not mistaken?
Is every number calculated via that rule of (2^n)-1 prime?
LjSpike
THREAD STARTER
 
Posts: 89
Age: 20
Male

United Kingdom (uk)
Print view this post

Re: Set of little observations with prime numbers...

#4  Postby newolder » Mar 12, 2017 4:36 pm

Eratosthenes sieve is another method and there are probably others.


See also, Prime (Ulam) spirals:
I am, somehow, less interested in the weight and convolutions of Einstein’s brain than in the near certainty that people of equal talent have lived and died in cotton fields and sweatshops. - Stephen J. Gould
User avatar
newolder
 
Name: Albert Ross
Posts: 7310
Age: 1
Male

Country: Feudal Estate number 9
Print view this post


Return to Mathematics

Who is online

Users viewing this topic: No registered users and 1 guest