71Sir, If I take k=3 ? It comes out 25 which isn't a prime number?
4 Answers
11A number n > 1 is prime if it cannot be written as a product of two integers a and b, both of which are larger than 1:
n = a*b
71
36@Vivek : Exactly... Also if we put k = 1 then we get 9 which is not a prime...
@Nishant sir : The solution is from one of the books that u've sent me..
The solution is here:......
It is from the fact that if n is a composite number greater than 1 then it has prime
factors p < n
Now, √101 ≈ 10
and non of the prime numbers less than 10 i.e., 2,3,5,7 divides 101. Thus
101 is a prime number...