Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 230: | \[{4^{230}-1\over3}\] | 52 × 11 × 31 × 41 × 47 × 277 × 461 × 691 × 1013 × 1657 × 5981 × 14951 × 30269 × 178481 × 2796203 × 4036961 × 15096281 × 1021622741 × 1884103651 × 7834788541<10> × 345767385170491<15> × 2646507710984041<16> × 359006912765190408181<21> |