Question

make a list of all odd number between 1and 100 which are not prime number ( use of silve oferatosthenes)​

Answer 1

Answer:

3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, and 97. Except these all numbers rest are odd numbers which are not prime numbers.

Answer 2

Answer:

1, 9 , 15 , 21 , 25 , 27 , 33, 35 , 39 , 45 , 49 , 51 , 55 , 57 , 63 , 65 , 69 , 75 , 77 , 81 , 85 , 87 , 91 , 95 , 99

Step-by-step explanation:

To find : Make a list of all odd numbers between 1 and 100 which are not prime number?

Solution :

Using Sieve of Eratosthenes method,

Step 1 - Write all the numbers from 1 to 100. Then Highlight 1, which is not a prime number.

Step 2 - Mark the multiples of 2 and highlight them as they all are even number.

Step 3 - From the numbers that are left, we look for the multiples of 3 and highlight them (except for 3, since it’s prime).

Step 4 - Now it’s time to look for the multiples of 5 as they all end in either 0 or 5 (except 5, because it’s prime).

Step 5 - Let’s move on to the multiples of 7 (except for 7, since it’s prime).

Step 6 - Write all the prime numbers between 1 to 100 that are odd and prime.

3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, and 97.

Except these all numbers rest are odd numbers which are not prime numbers.

1,9 , 15 , 21 , 25 , 27 , 33, 35 , 39 , 45 , 49 , 51 , 55 , 57 , 63 , 65 , 69 , 75 , 77 , 81 , 85 , 87 , 91 , 95 , 99.

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