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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.
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%I #13 Apr 06 2014 08:48:27

%S 8,9,121,343,2209

%N 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.

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

%Y Cf. A025475, A239524, A239879.

%K nonn,hard,more

%O 1,1

%A _Alex Ratushnyak_, Mar 21 2014