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A239520
Prime powers (A025475) such that the distance to the nearest prime power is a triangular number (A000217).
3
1, 4, 8, 9, 49, 64, 125, 128, 2187, 2197, 654481, 657721, 1442401, 1442897, 1708249, 7252249, 7946761, 13053769, 13082689, 21557449, 39677401, 39702601, 86136961, 86174089, 106729561, 106770889, 184063489, 253987969, 302516449, 626550961, 626651089, 844425481
OFFSET
1,2
CROSSREFS
KEYWORD
nonn
AUTHOR
Alex Ratushnyak, Mar 20 2014
STATUS
approved