If `3+5+6+9+10+12+15+18+20+...+100=N`, the find the number of distinct prime factors of N

If a in N and 1 le a le 20 , then find the number of prime numbers in the form of 5a+1 .

The number of distinct prime factors of the smallest 5-digit number is

If a varepsilon N and 1<=a<=20, then find the number of prime numbers in the form of 5a+1.

If N=12^(3)xx3^(4)xx5^(2) , then the total number of even factors of N is

If A = {9, 10, 11, 12, 13} and let f : A rarr N is defined by f(x) = highest prime factor of x. then the number of distinct elements in the image of f is :

Let A ={9, 10, 11, 12, 13) and f: A-> N be defined by f(n)-highest prime factor of n, 33. 1) (13) 3) (11, 13 13, 5, 11, 13 4) [2, 3, 5, 11)

If n is a natural and n=p_1^(x_1)p_2^(x_2)p_3^(x_3)," where "p_1,p_2,p_3 are distinct prime factors, then the number of prime factors for his