Base 26 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 81: | \[{26^{81}-1\over25}\] | 19 × 37 × 109 × 163 × 433 × 308933353 × 7050697273<10> × 88587776413<11> × 73894346582909221<17> × 609261029932504497272673841<27> × 3491070124645076944820721728671<31> |