# Question: What Is Peterson Number?

## What are Disarium numbers?

A number is called Disarium if sum of its digits powered with their respective positions is equal to the number itself..

## Is 153 an Armstrong number?

An Armstrong number of a three-digit number is a number in which the sum of the cube of the digits is equal to the number itself. Hence 153 is an Armstrong number.

## What is the weirdest number?

The smallest weird number is 70. Its proper divisors are 1, 2, 5, 7, 10, 14, and 35; these sum to 74, but no subset of these sums to 70. The number 12, for example, is abundant but not weird, because the proper divisors of 12 are 1, 2, 3, 4, and 6, which sum to 16; but 2 + 4 + 6 = 12.

## What is vampire number in Java?

In number theory, a vampire number (or true vampire number) is a composite natural number with an even number of digits, that can be factored into two natural numbers each with half as many digits as the original number and not both with trailing zeroes, where the two factors contain precisely all the digits of the …

## What is the most attractive number?

1.618. The so-called Golden Number or phi defines a ratio that appears repeatedly in nature, for example in the way many flowers’ petals are formed. Some claim it is also associated with beauty, although leading mathematicians insist this is not true.

## What is a special number?

Special Numbers in Java are ones whose sum of factorials of digits is equal to the number itself. It can be an N digit number. The program has to first break the number into its corresponding digits and calculate their factorials. … If the sum matches the original number then the number is called to be a Special number.

## What is factorial number?

Factorial, in mathematics, the product of all positive integers less than or equal to a given positive integer and denoted by that integer and an exclamation point. Thus, factorial seven is written 7!, meaning 1 × 2 × 3 × 4 × 5 × 6 × 7. Factorial zero is defined as equal to 1. Factorial. Quick Facts.

## What is factorial number example?

The factorial of a number is the product of all the integers from 1 to that number. For example, the factorial of 6 is 1*2*3*4*5*6 = 720 . Factorial is not defined for negative numbers, and the factorial of zero is one, 0! = 1 .

## Is 2 A Armstrong number?

-digit numbers which are the sums of any single power of their digits. … th powers of their digits (a finite sequence) are called Armstrong numbers or plus perfect number and are given by 1, 2, 3, 4, 5, 6, 7, 8, 9, 153, 370, 371, 407, 1634, 8208, 9474, 54748, … (OEIS A005188).

## How do you check a number is Armstrong or not?

When the sum of the cube of the individual digits of a number is equal to that number, the number is called Armstrong number. For Example 153 is an Armstrong number because 153 = 13+53+33.

## Which is strong number?

Strong number is a number whose sum of all digits’ factorial is equal to the number ‘n’. Factorial implies when we find the product of all the numbers below that number including that number and is denoted by ! (Exclamation sign), For example: 4! = 4x3x2x1 = 24.

## What is the Krishnamurthy number?

A Krishnamurthy number is a number whose sum of the factorial of digits is equal to the number itself. For example 145, 1! + 4! + 5!

## What is strong number example?

Strong number is a special number whose sum of the factorial of digits is equal to the original number. For Example: 145 is strong number. Since, 1! + 4!

## Is perfect number Java?

This is a Java Program to Check if a given Number is Perfect Number. A perfect number is a positive integer that is equal to the sum of its proper positive divisors excluding the number itself. Enter any integer as an input.

## What is the number six?

6 is the smallest positive integer which is neither a square number nor a prime number. Six is the second smallest composite number; its proper divisors are 1, 2 and 3. Since six equals the sum of its proper divisors, six is the smallest perfect number, Granville number, and. -perfect number.

## How do you find the perfect number?

In number theory, a perfect number is a positive integer that is equal to the sum of its positive divisors, excluding the number itself. For instance, 6 has divisors 1, 2 and 3 (excluding itself), and 1 + 2 + 3 = 6, so 6 is a perfect number.

## Is 7 a happy number?

, and so on. For example, starting with 7 gives the sequence 7, 49, 97, 130, 10, 1, so 7 is a happy number. … The first few happy numbers are 1, 7, 10, 13, 19, 23, 28, 31, 32, 44, 49, 68, 70, 79, 82, 86, 91, 94, 97, 100, …

## How do you know if a number is factorial?

Approach: Divide x by 2, divide by 3, and so on, until you cannot divide further. If you reach the number 1, then it’s factorial number else not.

## Is zero an Armstrong number?

Armstrong number is a number that is equal to the sum of cubes of its digits. For example 0, 1, 153, 370, 371 and 407 are the Armstrong numbers.

## What is the most special number?

6174 is a harshad number, since it is divisible by the sum of its digits: 6174 is a 7-smooth number, i.e. none of its prime factors are greater than 7.

## What is the most famous number?

10 Famous Numbers911 is most recognizable as the number to call for emergencies. … 7 is the number most commonly designated as people’s favorite. … 73 is Sheldon Cooper’s favorite number (on the TV show The Big Bang Theory). … 10 is most famous because it’s usually the number of items on “top” or “most” lists!More items…