Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
104: | \[{5^{104}-1\over4}\] | 23 × 3 × 132 × 53 × 313 × 5227 × 38923 × 51169 × 305175781 × 537181587281<12> × 83181652304609<14> × 129044008326199409<18> |