- Why is 1729 a magic number?
- Why is 11 not a prime number?
- How do you find a prime number?
- What number can divide 97?
- What are the 4 smallest prime numbers?
- Why is 91 not prime?
- What type of number is 91?
- What are the prime numbers between 50 and 100?
- What is the prime number immediately after 50?
- How many numbers are there between 70 and 100?
- What are all the factors of 87?
- Why 1 is not a prime number?
- What is the 100th prime number?
- What is the smallest prime number?
- How much money do you get for finding a prime number?
- Is there a highest prime number?
- What are the prime numbers between 70 and 100?
- Is 91 a prime numbers?
- What is the 3rd smallest prime number?
- What is the opposite of a prime number?
- Is 2 not a prime number?

## Why is 1729 a magic number?

1729, the Hardy-Ramanujan Number, is the smallest number which can be expressed as the sum of two different cubes in two different ways.

1729 is the sum of the cubes of 10 and 9 – cube of 10 is 1000 and cube of 9 is 729; adding the two numbers results in 1729..

## 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.

## How do you find a prime number?

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).

## What number can divide 97?

Since 97 cannot be divided evenly by 2, 3, 5, or 7, we know that 97 is a prime number.

## What are the 4 smallest prime numbers?

The first 1000 prime numbers141–202721–40738941–6017919361–8028331114 more rows

## Why is 91 not prime?

As we can see why is 91 not a prime number it is because it has more than two factors other than 1 and the number itself. It contradicts the definition of prime numbers. So 91 is a composite number because composite numbers have factors more than 2. Here we get four factors for 91 and they are 1, 13, 7, 91.

## What type of number is 91?

For 91 to be a prime number, it would have been required that 91 has only two divisors, i.e., itself and 1. However, 91 is a semiprime (also called biprime or 2-almost-prime), because it is the product of a two non-necessarily distinct prime numbers. Indeed, 91 = 7 x 13, where 7 and 13 are both prime numbers.

## What are the prime numbers between 50 and 100?

53,59,61,67,71,73,79,83,89,97…

## What is the prime number immediately after 50?

53The immediate prime number before 50 is 47 while the immediate prime number after 50 is 53.

## How many numbers are there between 70 and 100?

68 numbersAnswer. Answer: if you don’t count 70th and 100th… then there are 70-2 =68 numbers in between 70 and 100.

## What are all the factors of 87?

Answer and Explanation: The prime factors of 87 are 1, 3, 29, 87.

## Why 1 is not a prime number?

The number 1 is divisible by 1, and it’s divisible by itself. … My mathematical training taught me that the good reason for 1 not being considered prime is the fundamental theorem of arithmetic, which states that every number can be written as a product of primes in exactly one way.

## What is the 100th prime number?

541 the 100th. 7919 is the 1000th, and 1,299,709 is the 100,000th prime. … 13331 is the smallest prime palindrome to have 3 consecutive digits.

## What is the smallest prime number?

The smallest prime numbers are 2, 3, 5, 7, 11, 13, 17, 19 and 23. The number 2 is the only even prime number. The number 7 has only two factors: 1 and itself. The number 11 has only two factors: 1 and itself.

## How much money do you get for finding a prime number?

(If someone discovers a prime number of 100 million digits, the prize is $150,000 from the Electronic Frontiers Foundation. The first 1 billion-digit prime is worth $250,000.)

## Is there a highest prime number?

The Great Internet Mersenne Prime Search (GIMPS) has discovered the largest known prime number, 277,232,917-1, having 23,249,425 digits.

## What are the prime numbers between 70 and 100?

So there are no more prime number factors. The prime numbers between 70 and 100 are 71, 73, 79, 83, 89, 97. 2.

## Is 91 a prime numbers?

To find whether 91 is a prime number, first, check whether (9+1) is divisible by 3. Since 9+1 is 10 which is not divisible by 3, continue with the following steps. … So, 91 is divisible by 7 other than 1 and itself. Hence, it is not a prime number.

## What is the 3rd smallest prime number?

Prime Numbers between 1 and 1,0002329313771737911312713117317918112 more rows

## What is the opposite of a prime number?

composite numbersThe opposite of prime numbers are composite numbers. A composite number is a positive nutural number that has at least one positive divisor other than one or itself.

## Is 2 not a prime number?

The first five prime numbers: 2, 3, 5, 7 and 11. A prime number is an integer, or whole number, that has only two factors — 1 and itself. Put another way, a prime number can be divided evenly only by 1 and by itself.