Generalized repunit prime (base 234).
For base 234, I found R61, R89, R97, R1381, R9011.
For base 235, I found R7, R19, R53, R227, R307.
For base 236, I found R3, R197, R467, R587.
For base 237, I found R7, R2621.
For base 238, I found R2, R7, R67, R1093, R1381.
For base 239, I found R5, R109, R2549.

To be completed...