Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 251: | \[{5^{251}-1\over4}\] | 8325671 × 31005529 × 26764103852479605977859789033668347244841095527945553608469891055799700188967124185915383179343833020181029567942183851489870543374149074879374861281447076713609<161> |