Base 13 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 99: | \[{13^{99}-1\over12}\] | 32 × 23 × 61 × 199 × 419 × 859 × 3169 × 18041 × 1609669 × 17551032119981679046729<23> × 2192746830056885246381227<25> × 4961804056982481090385314988238018557<37> |