Base 19 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 69: | \[{19^{69}-1\over18}\] | 3 × 127 × 277 × 2347 × 1530559 × 9555459481<10> × 16497763013<11> × 1335495402823<13> × 71425475193776503<17> × 167026691666949955561753<24> |