SPRP in base 59 and 61

For these bases 18 and 17, I found hitherto:
(18^3+17^3)/35
(18^47+17^47)/35
(18^53+17^53)/35
(18^2411+17^2411)/35
(18^4057+17^4057)/35
(18^7963+17^7963)/35

To be completed...