Breaking

6 May 2020

Prime Numbers

Prime Numbers


Definition of Prime Number

Prime number is a number which has only two factors 1 and the number itself
Examples: 2 = 1×2, 3=1×3,5=1×5,7=1×7,....
etc.
⊹ 1 is neither a prime nor a composite       number.
⊹ 2 is the smallest prime number.
⊹ Greatest two digits prime number is 97

How many prime numbers from 1 to  100?


25 prime numbers from 1 to 100.

The prime numbers are
2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97

How many prime numbers from 1 to 200?

46 prime numbers from 1 to 200

The prime numbers are
2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97,101,103,107,109,113,127,131,137,139,149,151,157,163,167,173,179,181,191,193,197,199

Twin Primes Number

Two prime numbers whose difference is 2 are called twin primes. 
For examples 3 and 5 are twin primes numbers since difference between 5 and 3 is 2.

How many pairs of twin primes numbers from 1 to 100 ?

8 pairs of twin primes from 1 to 100

The pairs of twin primes numbers are
(3,5);(5,7);(11,13);(17,19);(29,31);(41,43);(59,61);(71,73)

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