Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 237: | \[{7^{237}-1\over6}\] | 3 × 19 × 2371 × 913242407367610843676812931<27> × 529637338334729405483135077873<30> × 1056836588644853738704557482552056406147<40> × 468495386168173905599256243553374540214560578805627340592145689632582924447490087411741924445982603<99> |