Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 227: | \[{5^{227}-1\over4}\] | 863773591 × 17408515139<11> × 107857890714179<15> × 154907695140797990849<21> × 239976686263858506551<21> × 16831369699997499687405534401<29> × 114223618784447712095364474974480764422513325227090232439<57> |