Neon Number in Java2 min read

In this tutorial, we will write two programs for the Neon number in Java.

  1. Program to check whether the nuber neon number or not in Java
  2. Display all the neon numbers within the specified range in java.

Neon Numbers

A number is said to be a neon number if the sum of the digits of a square of the number is equal t the original number.
Example: 9 is a Neon number (see explanation in the diagram).

Procedure to Find Neon Number

  • Read an integer (n), user input.
  • Find the square of that number and store it in a variable.
  • After that, sum each of the digits of the squared number and again store it in some variable.
  • Lastly, compare the sum number with the original number (n). If both are equal then the given number is a neon number, else it is not a neon number.

Java Program to Check given number is Neon number or not

Based on the above procedure, let us apply it in a java program to check for neon numbers.


Enter the Number: 9
9 is a Neon Number.

//Another Execution
Enter the Number: 45
45 is not a Neon Number.

Java Program to find Neon numbers between a specified range

The following java program finds all the neon numbers present in the specified range. The range will be specified by the user during runtime. Using loops the program will find all the Neon numbers within that range.


Enter lower range: 0
Enter the upper range: 10000

All the Neon numbers between 0 to 10000 are:
0 1 9


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