Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 439: | \[{4^{439}-1\over3}\] | 3740281 × 104110607 × 5612260289<10> × 78527789689<11> × 127321491658223<15> × 122551752733003055543<21> × 6563213024281378912864020513717469284499<40> × 43738605422458594461749425887615137142500083312917612669874016537<65> × 873880146833642190373525520936770796845382029997855219402285283144955696825577908510162169<90> |