C program find the Good Number

How to Find Good Number in C program.?

What is Good Number?

A number is called a square free number if there does not 

exist a number greater than 1, whose square divides the 

number evenly/perfectly. For example, number 8 is not a 

square free number as number 4 (which is square of 2), 

divides 8. Similarly, number 4 is also not a square free 

number. However numbers 1, 3, 6 all are square free 

numbers.
A  number n is called a good number if following properties hold.


  • It is a square free number.
  • Let s denote the sum of all divisors of n (including non-trivial divisors like 1 and itself). Let c denote the number of prime numbers dividing s. Number c should be a prime number.
You will two numbers L, R, you have to find sum of divisors
(including non-trivial) of all the good numbers in the 
range L to R, both inclusive.


Go to the page of Good Number ;



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