Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 256: | \[{7^{256}-1\over6}\] | 210 × 52 × 17 × 257 × 353 × 769 × 1201 × 35969 × 169553 × 7699649 × 134818753 × 197231873 × 47072139617<11> × 531968664833<12> × 1110623386241<13> × 15266848196793556098085000332888634369<38> × 6856531741041792239054980342217258517995521<43> × 2783415704056554985941269027566547436008362462334209<52> |