Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 407: | \[{7^{407}-1\over6}\] | 223 × 1123 × 2887 × 3257 × 293459 × 527907491 × 736043221 × 4805345109492315767981401<25> × 11643102352954864389361600478501133609358106618218120867070804879645168300364468087816148713046037565515445011974284713176875228984416085308570014798151813909066491306697918274655977842309609182872392921323772444130289560189898347805855934193746836267468498481516257638021231221999863<284> |