Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
127: | \[{31^{127}-1\over30}\] | 3326327007387436647371529196858441<34> × 169916043902473061206008111985174811<36> × 116364063240584491858678517699024314664131179153757<51> × 1281727358929567649447530852033318803716275892077197401847742845030551<70> |