Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 75: | \[{31^{75}-1\over30}\] | 3 × 52 × 11 × 101 × 151 × 331 × 2521 × 4951 × 17351 × 13277801 × 327412201 × 20235942281002951<17> × 997936488044528101<18> × 2994938361626916310097900969699892125851<40> |