2, 3.................and 23.................20 gap...........and a 19.........like 1/9...........the last term in the harmonic series..........to have a single digit denominator............................19 integers in the gap...........


List of prime numbers up to 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