Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
89: | \[{31^{89}-1\over30}\] | 179 × 1476511 × 194382021317865834077<21> × 1895009826287880923167<22> × 1843793240833772195527188715497235054748361154878687143137366939289518721748165239<82> |