Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 219: | \[{7^{219}-1\over6}\] | 3 × 19 × 439 × 877 × 3675989 × 359390389 × 1958423494433591<16> × 16999040225222266951<20> × 7222605228105536202757606969<28> × 2851116683875011630728750076085750994956395457550352356569780110746271113218957147554185030682022963<100> |