Prove that a positive integer n is prime number, if no prime p less than or equal to `sqrtn` divides n.

For each positive integer n, let S_n =sum of all positive integers less than or equal on n. Then S_(51) equals

The number of all prime numbers less than 40 is ..

Prove that for any prime positive integer p ,sqrt(p) is an irrational number.

The set of prime numbers less than 99 is :

For how many positive integers ‘n’, n^3-8n^2+20n-13 is a prime?

Write all the prime numbers less than 15.

Write all the prime numbers less than 15.

The set of prime numbers less than 100 is :