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 = 145
145 = !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


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