Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
89: | \[{28^{89}-1\over27}\] | 11927 × 51977 × 174429180502286655544684177<27> × 214654232536534717362018939506696980445489631453230772552822854938115326121133488835159519827<93> |