Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
62: | \[{21^{62}-1\over20}\] | 2 × 11 × 78059 × 4540713283<10> × 3936833990413<13> × 272581865551637989<18> × 56748249908554278937564172324714039<35> |