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5 min read
Is 63 a prime number?
Blog K8
Sixty-three can really fool us! It can be written in theform 63 = 26 − 1, but it is not a Mersenne prime. It is two more than a prime: 63 = 61 + 2, but it is not a twin prime. And, it can be written as 2(3 1) + 1, where 31 is […]

Dino

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6 min read
Is 61 a prime number?
Blog K8
Do you want to learn something interesting today? Add the digits of 61 to get 6 + 1 = 7. The n, consider the first three prime numbers ending with seven: 7, 17 and 37; and add them to obtain 7 + 17 + 37 = 61 This is not only our original number but […]

Dino

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6 min read
Is 71 a prime number?
Blog K8
Did you know that about 71% of Earth is in fact water? That is why, from space, it looks like a beautiful blue planet. Number 71 has many more interesting properties For example, if we reverse its digits, we get 17 which is a prime number; and, as we will see next, so is 71. […]

Dino

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6 min read
Is 67 a prime number?
Blog K8
In English, being “at sixes and sevens” means to be confuse, uncertain, disorganized, or in disagreement with something. But not in this article! In what follows, we will study organized arguments that will clearly explain why 67 is a prime number, and we will all agree it is an interesting one. We will start recalling […]

Dino

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6 min read
Is 83 a prime number?
Blog K8
Among infinitely many integers, 83 is one of a kind. Number 83 is the only prime number thatcan be written, using the first three odd primenumbers, in the form $$3^p+5^p+7^p$$,where 𝑝 is a prime number because $$83=3^2\;+\;5^2\;+\;7^2$$. But, why is 83 a prime number? That’s what we will study next. We will start recalling some […]

Dino

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6 min read
Is 79 a prime number?
Blog K8
Some numbers are just amazing! For example, 11, 31, and 37 are all prime numbers and their sum is another prime number: 11 + 31 + 37 = 79. But that isn’t all l! When we reverse their digits we get the prime numbers: 11, 13, and 73 whose sum is the reverse of 79, […]

Dino

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5 min read
Is 59 a prime number?
Blog K8
We can see 59% of the Moon’s surface from Earth. Also, number 59 corresponds to the last minute in an hour, and to the last second in a minute. Those are only some appearances of 59 in our daily basis. A factor of a natural number is a positive divisor of the number. A proper […]

Dino

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4 min read
What are the multiples of 5?
Blog K8
What are the multiples of 5? We know that multiples are the result we get when we multiply two numbers. In other words – a multiple is a product of two numbers. You can also remember that word ‘multiple’ means the multiplication of two numbers. The multiples of 5 are the values that we get […]

Dino

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