There are only 2 primes in 80: 2 and 5.
61,67,71,73,79(i think so)
2*2*2*2*5 = 80
No primes are composite. The prime factors of 80 are 2 and 5.
there are 13 primes not 5.
2 x 2 x 2 x 2 x 5 = 80
There are 169 primes that are smaller than 1000.
There are no twin primes between 80 and 100. The closest to that range are (71, 73) and (101, 103).
41, 43, 47, 53, 59, 61, 67, 71, 73, 79 10 primes
There 25 primes less than 100: 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97.
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
it is infinite
All pairs of two primes are coprime. There are fifteen primes under 50. So that means there are 105 unique pairs of "coprime primes", or more generally, pairs of primes, under 50.