The largest Prime number less than 1000 is 997.
The largest prime number no less than 1000 is currently 257,885,161-1
9
1000 ÷ 8 = 125 → largest less than 1000 divisible by 8 is 124 x 8 = 992
One of them.
The proof that there is no largest prime:Assume that there are a finite number of primes for the sake of contradiction. Then, there should be a number P that equals p1p2p3...pn+1. P is either prime or not prime (composite). If it is prime, we just show that P is larger than the largest prime in the list. If it's not prime, it must be composite. Composite always has at least one factor that is prime, but since P is not divisible by any prime in the list, the unknown prime factor(s) must be something not in the list, this also shows that there is a prime larger than the largest prime in the list. Both cases show that no matter how large a list of prime numbers, there will be always at least one larger prime outside of that list.
210 has 4, which is the maximum possible. There are other numbers with 4 different prime factors.
Start with 1000 and work back, rejecting any composites that you find.
Actually the largest prime # is larger than 300 because 301 is prime
1009 is the smallest prime number greater than 1000.
9797 is the largest prime number less than 100.
67 will be the largest prime number less than 70.
The largest Mersenne prime less than 200 is 127.
The largest prime less than 20 is 19. The largest prime over 60 is 61. The sum of these two numbers is 80.
The sum of the two largest prime numbers less than 71 is 128.
You have to check with all the primes lesser than 269.
9
80
The largest known prime number is 243112609 - 1, the largest integer that is currently known to be a prime number. It was proven by Euclid that there are infinitely many prime numbers; thus, there is always a prime greater than the largest known prime.