Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 407: | \[{5^{407}-1\over4}\] | 149 × 24421 × 12207031 × 13971969971<11> × 8737481256739<13> × 13948519478190639299602198018682590892580808922858455797802631911640198009616124815568536121883226419019923030906131988973318718002668179882223592273702054601315779437674801425715780621966607518027021452367523127964528556542445237819143284900404701<248> |