Generalized repunit prime (base -245).
For base -249, I found R19, R103, R317.
For base -248, I found R7, R11, R163, R1951, R2897, R3391.
For base -247, I found R3, R43, R1993, R2801.
For base -246, I found R3, R227, R5897.
For base -245, I found R5, R29, R547, R7207, R8731.
For base -244, I found R71, R613.

To be completed...