50 and 52 are the even numbers in this range, the odd numbers will be all the others, which is just the number 51.
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49, 51, 53, 55.
The odd numbers between 40 and 53 are 41,43,45,47,49,51.
odd even numbers end in 0 2 4 6 8 odd numbers end in 1 3 5 7 9 53 ends in 3 so is odd
The odd composite numbers between 50 and 60 are 51, 55, and 57. Because all the primes are odd except for 2 and adding two odd numbers will result in an even number, one of the two prime numbers must be 2, which when added to an odd number will result in an odd number. So, we subtract 2 from each of these numbers and check whether it is prime. 51 - 2 = 49, which is not prime. 55 - 2 = 53, which is prime. 57 - 2 = 55, which is not prime. Thus, the number is 55, which can be written as 2 + 53.
There are 20. {21, 23, 25, 27, 29, 31, 33, 35, 37, 29, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59}