Base 3 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 687: | \[{3^{687}-1\over2}\] | 13 × 8047106008391<13> × 32356561399076305309<20> × 284663996630519253661<21> × 634538541879036040523<21> × 193795952251956993033428990650021813<36> × 1045963705876214920796627188811335128227156263690344876782164668343294332064615217521<85> × 24438508337653102022217820583683149890942321166976225646700464417270844911880283854688214755924509786561787449968750569340375244357601<134> |