SPRP in base 79 and 83

For base 62, I found hitherto:
(62^3-1)/61
(62^5-1)/61
(62^17-1)/61
(62^47-1)/61
(62^163-1)/61
(62^173-1)/61
(62^757-1)/61
(62^4567-1)/61
(62^9221-1)/61

To be completed...