Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 231: | \[{4^{231}-1\over3}\] | 3 × 72 × 23 × 43 × 67 × 89 × 127 × 337 × 463 × 617 × 683 × 5419 × 14323 × 20857 × 78233 × 599479 × 35532364099<11> × 581283643249112959<18> × 70180796165277040349245703851057<32> × 4982397651178256151338302204762057<34> |