Tech Mahindra off Campus Coding Question

In this post we will solve Tech Mahindra off campus coding question. We will see step by step algorithm for coding question and finally we will implement the code in java.

Tech Mahindra off Campus Coding Question


Write an algorithm which accepts an Integer from user say n . After that return the difference beween lowest prime factor and input number as output.

Prime factors: The prime numbers that divides an integer exactly are called as prime factors.

Assumptions: n>1

Note: 1 is not a prime number.



n: 350




350=2x5x5x7 , therefore prime factors of 350 are 2,5,7. Since 2 is the smallest prime factor of 350 , difference will be 350-2=348.

  • First step will be to take the input from the user which is n
  • Find the prime factors for number
  • sort the prime factors in ascending order (we will get in this order itself )
  • Take the n value and find the difference between n and lowest prime factor of the number.
  • congrats you just solved the off campus coding problem, we have lot of problems like this to know more Click Here.

Java Code for Prime Factors Difference Problem

import java.util.*;

public class primefactors {
    public static void main(String[] args) {
        Scanner sc = new Scanner(;

        int n = sc.nextInt();
        int m = n;
        int array1[] = new int[10];
        int k = 0;
        int res = 0;

        while (n > 1) {

            for (int j = 2; j > 1; j++) {
                if (n % j == 0) {
                    array1[k] = j;
                    k += 1;
                    n = n / j;
                    j = j - 1;
                } else {



        res = m - array1[0];


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