Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 455: | \[{28^{455}-1\over27}\] | 53 × 113 × 131 × 2521 × 206501 × 637421 × 4422461 × 72416371 × 4543753614603737<16> × 90216355836698261<17> × 3770286508141148096921<22> × 99885743242098024883367081<26> × 3276407634171096216610291054196844397042681<43> × 151211210289786851561817502989696437469675204045434254843665511834290768780315660400582842258304186236901<105> × [166315572277850242915709256523013441458894258662569447476230901270630816282409759428984590147871911423890382418292170526138398108504628249667586640692288192026848887835863717693026834840049998486672102210289378372505638701724147967089491556893015650442960095425501975156977687232605866045117164719366553190727270201951576173028813537142903824726717409808060487884806362234636541690129514380062581<396>] |