What is the sum of all prime numbers between 1 and 20?

Given n = 1 + x and x is the product of four consecutive integers. Then which of the following is tr...

If x is an even number, then $x^{4n}$, where n is a positive integer, will always have...

If m and n are positive integers, then the digit in the unit's place of $5^n$ + $6^m$ is always...

How many prime numbers are there between 0 and 50?...

The sum of three prime numbers is 100. If one of the numbers is 36 more than another, find one of t...

Which of the following prime numbers, when dividing 2176, leaves a remainder of 9?...