A prime number is an integer, ... and then crossed out all multiples of numbers until the square root of the largest number in the grid is crossed out. ... So for this chart, ...

A prime number is a number with exactly two factors. Prime numbers are only divisible by 1 and itself. Another way to think of prime numbers is that they are only ever found as answers in their ...

These efficiency tricks slash our search drastically from around 100 million numbers to only 1,228 (the number of primes less than the square root of 99,400,891). For those curious, 99,400,891 ...