# What is the origin of XOXO?

## What is the origin of XOXO?

From use of X/x to mean ¡°kiss¡± and O/o to mean ¡°hug¡±. Use of ¡°X¡± to indicate a kiss attested since 1763, preceded by medieval use of an ¡°X¡±, which was then kissed by illiterates to indicate a signature. Use of ¡°O¡± is more recent, and presumably created by analogy (e.g., X/O in tic-tac-toe).

## What is composite number in maths?

In Mathematics, composite numbers are numbers that have more than two factors. These numbers are also called composites. Composite numbers are just the opposite of prime numbers which have only two factors, i.e. 1 and the number itself.

## How to print 1 to 100 prime numbers in Java?

Algorithm STEP 1: START. STEP 2: SET ct =0, n=0, i=1,j=1. STEP 3: REPEAT STEP 4 to STEP 11 until n<25. STEP 4: SET j= 1. STEP 5: SET ct = 0. STEP 6: REPEAT STEP7 to STEP 8 UNTIL j<=i. STEP 7: if i%j = = 0 then ct =ct +1. STEP 8: j = j + 1. More items...

## What is the fundamental theorem of arithmetic class 10?

Therefore, every natural number can be expressed in the form of the product of the power of its primes. This statement is known as the Fundamental Theorem of Arithmetic, unique factorization theorem or the unique-prime-factorization theorem.

## What is an integer in math?

What is an integer and what are examples of integers? An integer (pronounced IN-tuh-jer) is a whole number (not a fractional number) that can be positive, negative, or zero. Examples of integers are: -5, 1, 5, 8, 97, and 3,043. Examples of numbers that are not integers are: -1.43, 1 3/4, 3.14, .

## Are all odd numbers prime?

No, every odd number is not a prime number. Example: 9 is an odd number having factors 1, 3 and 9 and is not a prime number.

## What is odd composite number?

Odd composite numbers are all the odd integers that are not prime. 9, 15, 21, 25, 27, etc, are examples of composite odd numbers. The smallest odd composite number is 9. Even composite numbers are all even numbers and are not prime.

## Is the smallest prime number?

A prime number must have exactly two factors (1 and the number itself). Therefore, the number 2 is the lowest prime number as its only factors are 1 and 2.

## Why is 31 a composite number?

Is 31 a Composite Number? No, since 31 has only two factors, i.e. 1 and 31. In other words, 31 is not a composite number because 31 doesn’t have more than 2 factors.

## Why is 31 special?

31 is the 11th prime number. It is a superprime and a self prime (after 3, 5, and 7), as no integer added up to its base 10 digits results in 31. It is a lucky prime and a happy number; two properties it shares with 13, which is its dual emirp and permutable prime. 31 is also a primorial prime, like its twin prime, 29.

## Is 31 a natural number?

The natural numbers from 1 to 100 are 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, …

## Why Java is platform independent?

Java is platform-independent because it uses a virtual machine. The Java programming language and all APIs are compiled into bytecodes. Bytecodes are effectively platform-independent. The virtual machine takes care of the differences between the bytecodes for the different platforms. 8 Feb 2021

## How to take input in Java?

Example of String Input from user import java.util.*; class UserInputDemo1. { public static void main(String[] args) { Scanner sc= new Scanner(System.in); //System.in is a standard input stream. System.out.print(“”Enter a string: “”); String str= sc.nextLine(); //reads string. More items…

## What is prime number composite number?

A prime number is a number which has exactly two factors i.e. ‘1’ and the number itself. A composite number has more than two factors, which means apart from getting divided by 1 and the number itself, it can also be divided by at least one positive integer. 1 is not a prime or composite number.

## What is prime vs composite?

A prime number has only two factors, itself and one. A composite number has at least three factors, and sometimes a lot more.

## How do you teach prime vs composite?

Tell them if they cannot divide a number by any other number than itself and one, it is prime. Define composite numbers as whole numbers that have factors in addition to 1 and itself. Tell students 1 and 0 are neither prime nor composite.

## Why is 1 not a prime number?

1 can only be divided by one number, 1 itself, so with this definition 1 is not a prime number.

## What are prime and composite numbers Year 5?

A prime number is a number which only has 2 factors: 1 and itself. 2 is the first prime number, as its only factors are 1 and 2. A non-prime number is called a composite number.

## How many prime numbers are there between 1 and 100000?

Table 2. ¦Ð(x) verse x/ln x x ¦Ð(x) x/(ln x -1) 1000 168 169 10000 1229 1218 100000 9592 9512 1000000 78498 78030 2 more rows

## What are odd numbers from 1 to 100?

Odd numbers 1 to 100 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79, 81, 83, 85, 87, 89, 91, 93, 95, 97, 99. 29 Jul 2022