Base 5 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
289: | \[{5^{289}-1\over4}\] | 409 × 17341 × 81053519 × 466344409 × 27605542907603789<17> × 9027110169772242694759<22> × 37622714845008376879428780813055087463805851753114046875066243488323742538151984814426139261643095244959654432633583780200141617092479941969<140> |