Java program to generate Collatz Conjecture sequence.

import java.util.Scanner;

// © 2017 TheFlyingKeyboard and released under MIT License

public class CollatzConjecture {
  public static void main(String[] args) {
    Scanner input = new Scanner(;
    int number;
    int iterNum = 0;
    System.out.print("Enter a number: ");
    number = input.nextInt();
    System.out.print(number + " ");
    if(number > 0){
      while(number != 1){
        number = collatzConjecture(number);
        System.out.print(number + " ");
      System.out.println("It took " + iterNum + " iterations to reach 1");
  static int collatzConjecture(int num)
        if (num % 2 == 0)
            return num / 2;
            return 3 * num + 1;


Java Collatz Conjecture Sequence Generator
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