17
A number that has only one and itself as factors is a prime number and so therefore it can't have four other identical factors.
The only factors of a prime are 1 and itself. So, the only factor smaller than the number itself is 1. Therefore the sum of all factors smaller than the number is 1. But 1 is not a prime number. Thus, there is no prime number that is a perfect number.
That's a prime number.
If the number 1 is considered a factor, then these are the prime numbers. Their only factors are 1 and themselves.
Any prime number
the answer is 25 because you're asking for a number greater than 12 and smaller than 40 and has exactly 3 factors so in that case 25 is the only one.
A number that has only one and itself as factors is a prime number and so therefore it can't have four other identical factors.
A composite number is a natural number that can be divided into smaller factors (which are also natural numbers). For example, 6 = 2 x 3. A prime number is an integer (greater than 1) that cannot be separated into smaller factors. For example, 7 can't be divided into smaller factors.
The only factors of a prime are 1 and itself. So, the only factor smaller than the number itself is 1. Therefore the sum of all factors smaller than the number is 1. But 1 is not a prime number. Thus, there is no prime number that is a perfect number.
the answer is 25, the factors are 1,5,25
No. For example, 30 has the factors 1, 2, 3, 5, 6, 10, 15, 30; while 31 only has the factors 1 and 31 - in other words, it's a prime number. Note that there are arbitrarily large prime numbers (there is no last prime number); each of them has exactly two factors.
A prime number.
Yes.
That's a prime number.
If the number 1 is considered a factor, then these are the prime numbers. Their only factors are 1 and themselves.
A prime number is a number, greater than 1, that has only two factors: 1, and the number itself.
That's a prime number.