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Q: How many primes are expressed as a number squared plus 1?
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How many of the first ten whole numbers can be expressed as the sum of the two different primes?

Five of them.


What number has the product of exactly three different prime numbers?

Since there are infinitely many primes, there are infinitely many numbers that are products of 3 primes.


How many primes begin with 9?

only one has and that is the number 3


How many primes number begin with 8?

Believe it or not, the number of prime numbers beginning with 8 is infinite.


Which number has many factors?

Suppose a composite number x can be expressed as a product of primes p, q, r ... in exponential form as x = pa*qb*rc ... has (a+1)*(b+1)*(c+1) ... factors. So, the bigger a, b, c etc are, the greater the number of factors.


How many Primes in Transformers are there?

there are 13 primes not 5.


How many twin primes are there?

There are an infinite number of twin primes. This is true, but as yet there has not been published a valid proof of it. Perhaps soon someone will publish a valid proof.


What are all the prime numbers 1000-1500?

the answer could have something to the ratio of prime numbers between 0 and 9 to the the number of prime primes between 9 and 625 and the number of primes between the square 25x25. Hint: the are 9 primes between 0 and 25. There are 114 primes between 25 and 625. There is a square number somewhere near 1000. 961 which is the Mercienne prime number 31 squared. without giving the answer away, by dividing 625 by 9 we get the ratio 12.6666667 or 12 and 2 3rds. this is one of many ratio to help find how many prime numbers within a given range. once the precise ascending pattern of prime numbers is discovered then any prime number to infinity can be calculated and identified disclosure: this information is designed to provide food for thought on the matter of the question above and is not a precise answer.


How many primes factors does the number 189 have?

Two distinct prime factors, four altogether.


How many even primes in 100 grid?

One; the only even prime number is two.


How many primes begin with 8?

Believe it or not, the number of prime numbers beginning with 8 is infinite.


How many even primes are there less than 100?

The only even prime number is... 2 !