Generalized repunit prime (base -214).
For base -215, I found R277.
For base -214, I found R73, R157, R8867.
For base -213, I found R59, R239, R6607, R7177.
For base -212, I found R2, R101.
For base -211, I found R79, R6659.
For base -210, I found R3, R8311.

To be completed...