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An n-digit number has 4^n such numbers.
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What is the longest number string that only consists of prime numbers?
The longest string of consecutive numbers that are primes is two digits long, consisting of 2 and 3 only. There are no other consecutive numbers that are primes because no even numbers greater than 2 are primes.
Which set of numbers includes prime numbers only?
The set of primes would be one. The set of Mersenne primes is another. The set of all primes below 50 is another. And so on. A set which includes all primes, and only them, is the set of numbers having exactly 2 factors.
Are there any palindromic primes with an even number of digits greater than 11?
No, 11 is the only palindromic prime with an even number of digits.
How many different pairs of prime numbers goes into 50?
There is only 1 pair of primes and they are 2*5.
The prime numbers 2 and 3 are consecutive primes since one follows the other are there any of consecutive primes?
2 and 3 are the only consecutive primes.
What are your prime numbers in your twenties?
The only primes in the twenties are 23 and 29.
What is a consecutive primes?
2 and 3 are the only consecutive numbers that are prime.
How many four-digit numbers consist of only even digits?
500
Can two consecutive numbers both be primes?
Yes. The only time this occurs is right at the start of the list of primes: 2, 3.
How many even primes are there?
only one: 2.'2' is the only even prime number. All other even numbers have '2' as a factor.
How many primes are there in 80?
There are only 2 primes in 80: 2 and 5.
How many numbers can be formed using digits 1245?
Assuming each of the given digits can be used only once, the answer is 24. If not, the answer is infinity.
