Largest prime??

Number Theory Level 3

What is the last digit of the largest prime number?

8 6 1 3 5 None of these

1 solution

André Hucek
Oct 25, 2017

Since $p$ doesn't have any kind of restriction, for ex. ''What is the last digit of the largest known prime number ?'', we can't answer with any digit as we know that there are infinitely many primes.

Therefore the answer is $\boxed{\text{None of these}}$ .

I think so. There is no largest prime number.

Munem Shahriar - 3 years, 7 months ago

As I said, a prime's last digit can be determined for $p \le n$ for finite $n$ 's, there are proofs that there are infinitely many primes.

André Hucek - 3 years, 7 months ago

Can you change "it is believed" to "we know"? The former suggests that it might not necessarily be true.

Calvin Lin Staff - 3 years, 7 months ago

I also believe the answer is however, after I Google , the prime was recently been discovered. According to the last digit is $1$ .

Naren Bhandari - 3 years, 7 months ago

That is the largest explicitly known prime, as opposed to the actual "largest prime" (which does not exist).

If that's still not clear, think about this related question

What is the last digit of the largest integer?

Calvin Lin Staff - 3 years, 7 months ago

Largest prime??

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