Base 26 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 61: | \[{26^{61}-1\over25}\] | 2441 × 12622609 × 136644408227<12> × 1954904040896695476334393178349255487123510660072282781835814597<64> |