Oh, dude, you're really testing my math skills here. Let me grab my calculator... just kidding. The sum of the prime numbers between 51 and 69 is 53 + 59 + 61 + 67, which equals 240. So, like, if you were wondering if you could impress your friends with this fact at a party, you totally can.
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There are ten prime numbers between 51-100.
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.
The prime numbers between 51 and 80 are: 53, 59, 61, 67, 71, 73 and 79
number of prime numbers between 51 and 101 = 10prime numbers between 51 and 101 = 53, 59, 61, 67, 71, 73, 79, 83, 80, 97
The numbers are 34 and 51, which have a sum of 85 and their LCM is 102, the multiple of the highest power of their prime factors 2, 3, 17.