Base 4 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 413: | \[{4^{413}-1\over3}\] | 43 × 127 × 827 × 2833 × 37171 × 179951 × 1824726041 × 2006647231 × 3203431780337<13> × 170735974773267443<18> × 6774027833473375976915021445395839<34> × 21256743751927370220630952377105576570016395501658460697868351<62> × 6043930497790503973481076813462520042997083539133970912065745573049492802026928038019<85> |