gunashekar
1 Answer(s)      6 years and 6 months ago
Posted in : Java Beginners

write a proggram to accept a number and check whether the sum of prime factors of a number is a prime number or not

April 29, 2011 at 11:50 AM

```import java.util.*;

class PrimeFactors {
static boolean isPrime(long number) {
boolean isPrime = false;
int i = (int) Math.ceil(Math.sqrt(number));
while (i > 1) {
if ((number != i) && (number % i == 0)) {
isPrime = false;
break;
} else if (!isPrime)
isPrime = true;
--i;
}
return isPrime;
}

public static void main(String[] args) {
Scanner input = new Scanner(System.in);
long n = input.nextLong();
long sum=0;
System.out.print("Sum of Prime Factors of " + n + " is: ");
for (long i = 2; i <= n / i; i++) {
while (n % i == 0) {
sum+=i;
n = n / i;
}
}
if (n > 1){
sum=sum+n;
}
else {
sum=sum+0;
}
System.out.print(sum);
System.out.println();
if(isPrime(sum)){
System.out.println("Sum of prime factors of a number is a prime number");
}
else{
System.out.println("Not Prime!");
}
}
}
```

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