Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 271: | \[{20^{271}-1\over19}\] | 195121 × 740958963395891<15> × 137848069582082921<18> × 4015208463415595125549<22> × [24955614489229346795265329554975647570141107210854433260146269146732165299971525860493750950709793803575469760329148542098800440003004307912554215190497644384605173529048153504411590390862184277383382080166503786855492337296542654235800414954688113190932745714734137670832414617393135149249659<293>] |