**Important points to remember-**

**Prime number**- Number that go in its own table and not in others table are called

**prime numbers**.

Eg- 2, 3, 5…. etc

**Composite number**- Number that go in its own table and also in others table are called

**composite number**.

Eg- 4, 6, 12….. etc

**Co-prime number**- Numbers which do not have any common divisor other than 1, are called

**co-prime numbers**

Eg- 25,29; 67,68

**Twin Prime numbers**- If the difference between 2 prime numbers is 2, then the two prime numbers are called

**twin prime numbers**.

**Important Points:-**

1 is neither a prime number nor a composite number.

Smallest prime number- 2

Co-prime number do not have any common divisor other than 1.

There are 8 pairs of twin prime numbers from 1 to 100:

3,5; 5,7; 11,13; 17,19; 29,31; 41,43; 59,61; 71,73.

## No comments:

## Post a Comment