42
37 is prime, 42 is composite.
Primes: 17 43 23 and 37 Composites: 50 77 42 and 39
37 is a prime number but 42 is a composite number
23, 29, 31, 37, 41
23 29 31 37 41.
42 and 52 are composite.
23 29 31 37 41
23, 29, 31, 37, 41.
37 is a prime number, so since 42 can not be divided by 37 evenly, they are indeed relatively prime.
41
There are 27 such numbers.
Answer: (5 & 37), (11 & 31), (13 & 29), (19 & 23)