PRP in base 79 and 83

For (43^n-41^n)/2, I found hitherto:
(43^13-41^13)/2
(43^19-41^19)/2
(43^109-41^109)/2
(43^461-41^461)/2
(43^11587-41^11587)/2
(43^13037-41^13037)/2

To be completed...