Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
66: | \[{31^{66}-1\over30}\] | 25 × 3 × 72 × 19 × 23 × 67 × 331 × 397 × 617 × 297991 × 757241 × 150332843 × 1048563011 × 34731987261785578083133<23> × 650141690025315305584300036801<30> |