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By: Carlos AubinUpdated: February 23, 2021

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The **prime numbers** less than **50**: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47.

So, what is the sum of odd prime numbers between 1 to 50?

The **sum** of the **odd prime numbers between 1 to 50** is 326.

Beside above, how many prime numbers are there between 0 and 50?

The **primes between 0 and 50** are: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47.

Why is 11 not a prime number?

For **11**, the answer is: yes, **11** is a **prime number** because it has only two distinct divisors: 1 and itself (**11**). As a consequence, **11** is only a multiple of 1 and **11**.

What are the prime numbers between 1 to 100?

List of all **prime numbers between 1 to 100**. There are 25 **prime numbers** till **100**. They 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.

Lesson 1. A **prime number** is a whole **number** greater than 1 that can only be divided by itself and 1. The **smallest prime numbers** are 2, 3, 5, 7, 11, 13, 17, 19 and 23. The **number** 2 is the only even **prime number**.

4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30, 32, 33, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49, **50**, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 98, 99, 100.

The 10 **prime numbers between 1 and 30** are 2, 3, 5, 7, 11, 13, 17, 19, 23, and 29.

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59.

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 positive integer with exactly **one** positive divisor. But it is **not a prime**.

The **factors of 50** are 1, 2, 5, 10, 25, and **50**. We can use prime factorization to get all the **factors**.

To prove whether a **number** is a **prime number**, first try dividing it by 2, and see if you get a whole **number**. If you do, it can't be a **prime number**. If you don't get a whole **number**, next try dividing it by **prime numbers**: 3, 5, 7, 11 (9 is divisible by 3) and so on, always dividing by a **prime number** (see table below).

So we can do the following: **Sum** of **odd** consecutive **integers from 1 to 100** = (**Sum** of **all** consecutive **integers from 1 to 100**) - (**Sum** of even consecutive **integers from 1 to 100**). **Sum** of odds = (**100** x 101/2) - [2 x (50 x 51/2)] = 5050 - 2550 = 2500.

The **number** series **1**, 3, 5, 7, 9, . . . . , 197. Therefore, 9801 is the **sum** of first **99 odd numbers**.

The first **25 prime numbers** (all the **prime numbers** less than 100) 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 (sequence A000040 in the OEIS). .

1275 is a **sum** of number series from **1 to 50** by applying the values of input parameters in the formula.