Smallest generalized repunit prime (with at least 3 1s) in base -284.
Repunits in all bases -300<=b<=360 were checked to at least 10000 1s, there are no prime found (with at least 3 1s) in the bases -220, -188, -187, -186, -175, -113, -103, -97, 184, 185, 200, 210, 269, 281, 306, 311, 326, and 331. The largest 10 currently known primes (sorted by the number of 1s) are (152^270217-1)/151, (18^25667-1)/17, (53^21943+1)/54, (124^16427+1)/125, (333^9743-1)/332, (284^9203+1)/285, (150^6883+1)/151, (205^5449+1)/206, (230^5333-1)/229, (91^4421-1)/90.

To be completed...