it looks like a 100 square grid with 1 to 100 and you highlight all the prime numbers
Eratosthenes
prime numbers are invented by srinivasan ramanujan, an Indian mathematician.
Eratosthenes
Prime numbers are not invented.
HE INVENTED LOts of thing one of them is PRIME numbers
Eratosthenes' method of finding prime and composite number is called 'The Sieve of Eratosthene'.
Eratosthenes, It says it is Eratosthenes.
11 is prime; 21 is not. To see whenever a number is prime or not, think if a number can be multiplied by another number to get that number. Or just look at a Sieve of Eratosthenes, if you're not a "thinky" person. :)
1 is neither prime nor composite because Eratosthenes decided that it was nor prime nor composite because 1x1 is 1, but then again,1x any other number is that number, so one can go into every number before and after infinity. Confusing right? Try looking up on Wiki the guy Eratosthenes.
The algorithm for identifying prime numbers which is known as the Sieve of Eratosthenes has been accepted as accurate for thousands of years.
Eratosthenes lived between 276 and 194 B.C. He didn't discover prime numbers; he devised a simple way to determine what numbers are prime in a given range.
One method for finding prime numbers is called the "Sieve of Eratosthenes" because it basically "sifts" through the numbers looking for numbers that are not not prime.