I think that the sequence is the number between twin primes:
3 and 5 are twin primes and the number between them is 4
5 and 7 are twin primes and the number between them is 6
11 and 13 are twin primes and the number between them is 12
17 and 19 are twin primes and the number between them is 18
29 and 31 are primes and the number between them is 30
41 and 43 are twin primes and the number between them is 42
59 and 61 are twin primes and the number between them is 60
_____ and _____are twin primes and the number between them is ______
101 and 103 are twin primes and the number between them is 102
This should make it easy to figure out what number is in the sequence between 60 and 102.
Prime numbers: 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61, 67, , ,