Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 248: | \[{7^{248}-1\over6}\] | 25 × 52 × 311 × 373 × 1201 × 4217 × 21143 × 9754399 × 33947629297<11> × 2541312025433<13> × 23235518871793<14> × 5420506947192709<16> × 3999088279399464409<19> × 74502648768583254173<20> × 196846325409292090901<21> × 1036024417080188485251071558297683047554904416365356912974660190950495137<73> |