# Peterson Number in C1 min read

In this tutorial, we will learn about the Peterson number and check if the number is Peterson or not in C.

## What is Peterson Number?

A number is said to be a Peterson number if the sum of factorials of each digit of the number is equal to the number itself.

Peterson numbers examples:

`Number = 145145 = !1 + !4 + !5= 1 + 4*3*2*1 + 5*4*3*2*1= 1 + 24 + 120= 145 = 145`

Therefore, we can see that after the sum of the factorial of 145 is equal to the number 145 itself. Hence the Peterson Number.

## C Program to check whether the number is Peterson Number or not

Peterson number program in C:

Output 1:

`Enter a number: 145 145 is a Peterson number`

Output 2:

`Enter a number: 55 55 is not a Peterson number`

### String Pattern Programs in C

In this tutorial, we will write various C pattern programs for String. Before that, you may go through the following topics in C. for loop …

### Java Program to Find pair of Integers in Array whose sum is given Number

In this tutorial, we will write a program to find a pair of elements from an array whose sum equals a given number in java …

### Program to Print Diamond Alphabet Patterns in C

In this tutorial, we will learn to write a C program to print Diamond patterns using alphabets/characters. However, in this tutorial, we will create a …

### Half Diamond Pattern in C using Alphabets

In this tutorial, we will learn and code the half diamond alphabet patterns in C programming language. However, in this tutorial, we will create a …

### Half Pyramid of Alphabets in C

In this tutorial, we will learn and code alphabet patterns in C programming language specifically the Half pyramid of alphabets in C programming. However, in …

### Inverted Half Pyramid Pattern of Alphabets in C

In this tutorial, we will write a C program to print half Pyramid using alphabets/characters. Before that, you may go through the following topic in …