Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 279: | \[{4^{279}-1\over3}\] | 32 × 7 × 19 × 73 × 16183 × 26227 × 34039 × 1437967 × 529510939 × 715827883 × 2147483647 × 2903110321 × 119232435043<12> × 85384915399027<14> × 833732508401263<15> × 658812288653553079<18> × 2034439836951867299888617<25> × 6444365376140611199022187<25> |