Base 15 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 84: | \[{15^{84}-1\over14}\] | 25 × 7 × 13 × 29 × 43 × 113 × 211 × 241 × 3361 × 3877 × 327517 × 723031 × 1743463 × 10678711 × 191354311 × 2817034275427<13> × 4454215139669<13> × 15360796671433620373<20> |