Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 30: | \[{20^{30}-1\over19}\] | 32 × 7 × 11 × 31 × 61 × 127 × 251 × 421 × 3001 × 152381 × 261451 × 26876632021<11> |
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 30: | \[{20^{30}-1\over19}\] | 32 × 7 × 11 × 31 × 61 × 127 × 251 × 421 × 3001 × 152381 × 261451 × 26876632021<11> |