Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 82: | \[{31^{82}-1\over30}\] | 25 × 83 × 7066933486329661873<19> × 42481797154433176612759<23> × 132259604354473376342663326676479453<36> × 61865491146216383674809135780235913078137<41> |