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

1,1

Links

Table of n, a(n) for n=1..5.

Example

The nearest prime powers above and below 121 are 81 and 125, because 125-121=4 divides 121-81=40, 121 is the sequence.

Crossrefs

Cf. A025475, A239524, A239879.

Sequence in context: A256162 A175556 A165467 * A041141 A041142 A307947

Adjacent sequences: A239581 A239582 A239583 * A239585 A239586 A239587

Keyword

nonn,hard,more

Author

Alex Ratushnyak, Mar 21 2014

Status

approved