Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 84: | \[{20^{84}-1\over19}\] | 32 × 72 × 13 × 29 × 43 × 71 × 127 × 197 × 401 × 421 × 827 × 10529 × 12277 × 14561 × 32719 × 460951 × 1464961 × 2750161 × 8651161 × 36363727 × 1424354653 × 8442733531<10> × 1327100500372993081<19> |