Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 551: | \[{7^{551}-1\over6}\] | 59 × 419 × 127540261 × 1557245495371<13> × 4534166740403<13> × 71316922984999<14> × [467851788772425645807174101071839160962971857509256420018278075633419507769701804629749673254391737353785196717425136105986039294760311092969476464891637354460434327547815299114358366586241338249683725756096284526081889091789022320422750769885915020304104180855908856929751450599752592907545191502648812295948349918879412949028349753008935837633767904177264296468743396295297152400593333923304946332140942951121731<414>] |