29
29
It is: 2
11
Yes, 887 is a prime number. Recall that if a number is not prime then there exists a prime less than the square root of the number and this prime divides the number. So we need to check if the primes less than 30 divides 887 or not. These primes are 2,3,5,7,11,13,17,19,23,29.
Prime number greater than 25 but less than 30 is 29.
5
Prime number which is greater than 30 and less than 35 is 31.
29 + 31 = 60
29
29
29
It is: 2
11
18
23 and 29 are the prime numbers between 20 and 30.
31