A239584 Prime powers p^q (A025475) such that either x divides y, or y divides x, where x and y are the distances from p^q to the nearest prime powers above and below p^q.
8, 9, 121, 343, 2209
Offset: 1
Examples
The nearest prime powers above and below 121 are 81 and 125, because 125-121=4 divides 121-81=40, 121 is the sequence.