Java program to calculate n-th element of Triangle Numbers sequence.

import java.util.Scanner;

// © 2017 TheFlyingKeyboard and released under MIT License

public class TriangleNumber {
  public static void main(String[] args) {
    Scanner input = new Scanner(;
      int n;
      System.out.print("Enter number: ");
      n = input.nextInt();

      System.out.print(n + "-th triangle number is equal to " + calculateTriangleNum(n));
  static int calculateTriangleNum(int n) {
      return (n * (n + 1)) / 2;


Java Triangle Number
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