Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 228: | \[{4^{228}-1\over3}\] | 3 × 5 × 7 × 13 × 17 × 229 × 241 × 457 × 571 × 1217 × 32377 × 90289 × 131101 × 148961 × 160969 × 174763 × 524287 × 525313 × 1212847 × 160465489 × 9036489073<10> × 275415303169<12> × 24517014940753<14> × 29034057164920993379000074993<29> |