Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
218: | \[{5^{218}-1\over4}\] | 2 × 3 × 1091 × 19403 × 1007161 × 1528399 × 4046322895447485867367<22> × 32707684672709516281678338357373622217207225350621<50> × 2293559892404294400692399012979688850301546383400890423075969<61> |