PRP in base 79 and 83 For (63^n-61^n)/2, I found hitherto: (63^19-61^19)/2 (63^37-61^37)/2 (63^131-61^131)/2 (63^347-61^347)/2 (63^2137-61^2137)/2 (63^7549-61^7549)/2 (63^7919-61^7919)/2
To be completed...