Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 647: | \[{4^{647}-1\over3}\] | 4570409 × 9021769 × 932184694939<12> × 303303806129303896428103<24> × 11502383762931955619183430785983<32> × 172803353799572189249788598530203678893171252012604993715049463781995845099<75> × 29307922565312016177602876538535303242036351301379160379360815405433230596154977919605727982403<95> × 167394614336255622287892974563562062279515450939194955645810372698957070837766887487273372150456980944216508605805295762403884169162369962423<141> |