Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 110: | \[{20^{110}-1\over19}\] | 3 × 7 × 112 × 23 × 61 × 251 × 152381 × 2209901 × 424016563147<12> × 10778947368421<14> × 2571413672161047121<19> × 167103718909962607171187251<27> × 11544868483876542417134734645670674427914239932800021<53> |