Base 8 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 509: | \[{8^{509}-1\over7}\] | 195457 × 12619129 × 1046666101231<13> × 49819993344092479<17> × 19089479845124902223<20> × 647125715643884876759057<24> × 51029680859871008335363724017<29> × 10751168288022146026259956092344345159681167846281852853736470411971627982051345994439553634116438524169<104> × 771527909673930801539336943549358495579318911179906405102389391498767667547295470889770045030258389155297066194579508093443313234599794902142610277641285812843112915108997894717571516546157338591955856999704004425892275248489054279480603169271<243> |