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13 and 15 are twin prime?
Actually, 13 and 15 are not twin primes because twin primes are pairs of prime numbers that have a difference of 2 between them. In this case, 13 is a prime number, but 15 is not a prime number because it can be divided by 3 and 5 in addition to 1 and itself. Therefore, 13 and 15 do not meet the criteria to be considered twin primes.
Two consecutive prime numbers which differ by 2 are said to be twin primes while two numbers whose hCF is 1 are called co-primes how many pairs of co-primes are between 1 and 50?
Any number greater than one can be co-prime. I guess the answer is 49.
What is the Number of prime numbers between 1 and 10 inclusive?
The primes between 1 and 10 are:2, 3, 5, 7The primes between 1 and 10 are:2, 3, 5, 7The primes between 1 and 10 are:2, 3, 5, 7The primes between 1 and 10 are:2, 3, 5, 7
Are all numbers between twin primes divisible by six?
Yes, all primes over three are either of the form 6n - 1 or 6n + 1. So the only way for them to be prime pairs is for one to be of the same n, one -1 and the other +1; so the number between them is always of the form 6n, and thus always divisible by six.
How many prime numbers are there between 1 and 100000?
There are 9592 primes.
