Base 6 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
254: | \[{6^{254}-1\over5}\] | 7 × 509 × 2287 × 6557252639250807127523<22> × 12514251972598061031154549270275982573061110378811783176435900357554799<71> × 133733063818254349335501779590081460423013416258060407531857720755181857441961908284738707408499507<99> |