- Why is 6174 a magic number?
- What is a Keith number in Java?
- What is a fascinating number?
- What is Krishnamurthy number?
- What is the tech number?
- What is a duck number?
- What is Capricorn number in Java?
- What is special number?
- What is Peterson number?
- What is Automorphic number in Java?
- Is perfect number Java?
- What is vampire number in Java?

## Why is 6174 a magic number?

6174 is known as Kaprekar’s constant after the Indian mathematician D.

R.

Arrange the digits in descending and then in ascending order to get two four-digit numbers, adding leading zeros if necessary.

…

Subtract the smaller number from the bigger number..

## What is a Keith number in Java?

Keith numbers are rare numbers with a Fibonacci like property. An n-digit number with value N is a Keith number if N is part of the Keith series generated. Keith numbers are also known as repfigit (repetitive Fibonacci-like digit) numbers. …

## What is a fascinating number?

A fascinating number is one which when multiplied by 2 and 3, and then, after the results are concatenated with the original number, the new number contains all the digits from 1 to 9 exactly once. For example, consider the number 192.

## What is Krishnamurthy number?

A Krishnamurthy number is a number whose sum of the factorial of digits is equal to the number itself. Given a number N as input. Write a program to check whether this number is krishnamurthy number or not.

## What is the tech number?

A tech number can be tech number if its digits are even and the number of digits split into two number from middle then add these number if the added number’s square would be the same with the number it will called a Tech Number.

## What is a duck number?

Last Updated: 21-04-2020. A Duck number is a positive number which has zeroes present in it, For example 3210, 8050896, 70709 are all Duck numbers. Please note that a numbers with only leading 0s is not considered as Duck Number. For example, numbers like 035 or 0012 are not considered as Duck Numbers.

## What is Capricorn number in Java?

A Kaprekar number for a given base is a non-negative integer, the representation of whose square in that base can be split into two parts that add up to the original number again.

## What is special number?

A number is known as Special number when sum of the factorial of digits is equal to the original number (given number). Examples: Below are examples of numbers which are Special. Number to check : 145 1! + 4!

## 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. Example: Input : n = 145 Output = Yes Explanation: 145 = 5!

## What is Automorphic number in Java?

Java Numbers: Exercise-14 with Solution Write a Java program check whether a number is an Automorphic number or not. In mathematics, an automorphic number is a number whose square “ends” in the same digits as the number itself.

## 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. … The Java program is successfully compiled and run on a Windows system.

## 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 …