Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
254: | \[{7^{254}-1\over6}\] | 23 × 35852863 × 260461507 × 554351226505275380676162672703<30> × 245341643198368582843352144598480744468850041775022125500767047213117<69> × 741032495985054494965752048538969622639319685349813800035647633877536858783525580078479148995633161<99> |