Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 97: | \[{31^{97}-1\over30}\] | 4657 × 14551 × 51217 × 116283302684682499<18> × 30659415876357956268132360096641321155619<41> × 12372817230444311573872645866104046378249477418408178679129943085048630543<74> |