Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 251: | \[{7^{251}-1\over6}\] | 503 × 27611 × 8895962998159<13> × 177669837175335119929176935701194838324252821819693597497081108536398599748700455000124352929722117028549948482221013097706100353941550906564040701778898732706050502407347416105293671115465331<192> |