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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.
From 1-100 what are the prime numbers?
Primes less than 202, 3, 5, 7, 11, 13, 17, 19,Primes between 20 and 4023, 29, 31, 37,Primes between 40 and 6041, 43, 47, 53, 59,Primes between 60 and 8061, 67, 71, 73, 79,Primes between 80 and 10083, 89, 97
