- What is the most attractive number?
- Why 1 is a special number?
- What is the weirdest number?
- What is Smith number in Java?
- Why 6 is a perfect number?
- Is 8 a perfect number?
- How do you find Automorphic numbers?
- What is special number?
- Is perfect number Java?
- What is amicable number in Java?
- What is Nelson number in Java?
- What number is a lucky number?
- What is factorial number?
- What is sunny number?
- What is lucky number in Java?
- What is Peterson number?
- What is vampire number in Java?
- Is 12 a perfect number?
- What is the most used number?
- What is a duck number?
- What is Krishnamurthy number?

## What is the most attractive number?

1.618.

This number is also known as Phi or Golden Number or Golden Ratio..

## Why 1 is a special number?

The number one is far more special than a prime! It is the unit (the building block) of the positive integers, hence the only integer which merits its own existence axiom in Peano’s axioms. … It is the only perfect nth power for all positive integers n. It is the only positive integer with exactly one positive divisor.

## What is the weirdest number?

Examples. 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 Smith number in Java?

Question: A Smith number is a composite number, the sum of whose digits is the sum of the digits of its prime factors obtained as a result of prime factorization (excluding 1). The first few such numbers are 4, 22, 27, 58, 85, 94, 121…

## Why 6 is a perfect number?

Most numbers are either “abundant” or “deficient.” In an abundant number, the sum of its proper divisors… Six is a number perfect in itself, and not because God created all things in six days; rather, the converse is true. God created all things in six days because the number is perfect.

## Is 8 a perfect number?

It is known that all even perfect numbers (except 6) end in 16, 28, 36, 56, 76, or 96 (Lucas 1891) and have digital root 1. In particular, the last digits of the first few perfect numbers are 6, 8, 6, 8, 6, 6, 8, 8, 6, 6, 8, 8, 6, 8, 8, …

## How do you find Automorphic numbers?

In mathematics, an automorphic number is a number whose square “ends” in the same digits as the number itself. For example, 52 = 25, 62 = 36, 762 = 5776, and 8906252 = 793212890625, so 5, 6, 76 and 890625 are all automorphic numbers.

## 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!

## 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 amicable number in Java?

Java Numbers: Exercise-16 with Solution Amicable numbers are two different numbers so related that the sum of the proper divisors of each is equal to the other number. … Input the first number: 220 Input the second number: 284 These numbers are amicable.

## What is Nelson number in Java?

Answer. A nelson number is a number with multiples of 111.

## What number is a lucky number?

The lucky numbers are suggested on the basis of one’s name, date of birth etc. Most common lucky numbers: 1, 3, 7, 9, 13, 15, 21, 25, 31, 33, 37, 43, 49, 51, 63, 67, 69, 73, 75, 79, 87, 93, 99, … Number 8 is lucky in Chinese culture because the Chinese word for “eight” sounds like the word for “wealth”.

## 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.

## What is sunny number?

A number N is called sunny number if the square root of the number N+1 is an integer number. … Example:- 24 is a sunny number because 24+1 = 25 has a square root of 5 which is an integer.

## What is lucky number in Java?

Removing every third number produces a sequence: 1, 3, 7, 9, 13, 15 … And this process continues, and we observe that some numbers remain indefinitely in the sequence. These numbers are known as Lucky Numbers.

## 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 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 …

## Is 12 a perfect number?

Twelve is a sublime number, a number that has a perfect number of divisors, and the sum of its divisors is also a perfect number. Since there is a subset of 12’s proper divisors that add up to 12 (all of them but with 4 excluded), 12 is a semiperfect number. … A twelve-sided polygon is a dodecagon.

## What is the most used number?

sevenA survey launched by a British mathematics writer has found that seven is the world’s favorite number, reports The Guardian. The results of the online survey were published on Tuesday, with three, eight and and four coming second, third and fourth.

## 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 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.