Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 105: | \[{20^{105}-1\over19}\] | 11 × 29 × 31 × 61 × 71 × 211 × 251 × 421 × 491 × 701 × 911 × 1051 × 3001 × 23311 × 32719 × 164011 × 261451 × 460951 × 8442733531<10> × 143677768081<12> × 13295107990361<14> × 338649469410070561<18> × 27455958930629469508499288821<29> |