Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 451: | \[{5^{451}-1\over4}\] | 12207031 × 888739699 × 2238236249 × 5079304643216687969<19> × 3485917866405562525199971298243728075849572010099191535446169994896663332220463665624763329757833201607725715780835707348031924735906376471771785232370565880992382558688242783676707388520004374461713881482165247816669121333796292610203290431944114839162789211938086553179<271> |