Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 356: | \[{20^{356}-1\over19}\] | 3 × 7 × 179 × 401 × 4374173 × 335939325419<12> × 1547547240361<13> × 4672596298001<13> × 133724350874825473368329<24> × 876115113230364511448369<24> × 124492966443240991427176240074946201<36> × 261786786940548104294757775699593263493783883864102345432362297509<66> × 25673620218659417895715388977688656867113014368379116031274193803841<68> × 166935052985763150198668215888986317563831853525107375426701090758064388025212097453<84> × 2947476284012810178331248152380952380952380952380952380952380952380952380952380952380952380952380952380952380952381<115> |