Base 13 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
76: | \[{13^{76}-1\over12}\] | 22 × 5 × 7 × 17 × 229 × 94621 × 12865927 × 9468940004449<13> × 104422877883960436477<21> × 580196961910046805312944783240761<33> |