Most software today is very much like an Egyptian pyramid with millions of bricks piled on top of each other, with no structural integrity, but just done by brute force and thousands of slaves. Alan Kay
Prime Number is a number which can be divided evenly only by 1, or itself. The prime number has only two divisors, 1 and same number. Prime numbers mainly used in public key cryptography. Example:- 13 We can divide only by 1 or 13. 13 doesn't have any other divisor. So, it is a prime number. 12 We can divide 1, 2,3,4,6. 12 has many divisors. So, it is not a prime number.
Print the first 20 primenumbers :1 2 3 5 7 11 13 17 19