Base 13 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 221: | \[{13^{221}-1\over12}\] | 53 × 103 × 443 × 77351 × 264031 × 1803647 × 710581301 × 3890188303 × 15798461357509<14> × 772029391886709642786384382234690485082047183735560110747262704871450490130127391654067619897<93> × 42138334940164665201410120987348753644674810539502965907187270282530828221296776352872924929727581<98> |