Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
106: | \[{20^{106}-1\over19}\] | 3 × 7 × 107 × 593071 × 24540050076369381718561<23> × 3257272076316750353139146661697870498891<40> × 400854439463328526924788607031597685803293279928793947485536270583<66> |