Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
93: | \[{20^{93}-1\over19}\] | 311 × 421 × 1489 × 11161 × 1646101 × 340037881769<12> × 581740080393079<15> × 735669815930822532937503688968508571966425959548932871142136554846387363229<75> |