Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 141: | \[{5^{141}-1\over4}\] | 31 × 177635683940025046467781066894531<33> × 16286160623917663079467944573580125726889931566772922392814390121<65> |