Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
59: | \[{31^{59}-1\over30}\] | 125693727758648407613<21> × 2593612406801473161066888689957754830054017617439929433838873336053<67> |