There are two ways of constructing a software design. One way is to make it so simple that there are obviously no deficiencies. And the other way is to make it so complicated that there are no obvious deficiencies. C.A.R. Hoare
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