Generalized repunit prime (base 198).
For base 195, I found R11, R73, R379, R2687.
For base 196, only R2 can be prime.
For base 197, I found R31, R47, R283.
For base 198, I found R2, R5, R9721.
For base 199, I found R577, R1831.
For base 200, no prime found up to R10000.

To be completed...