Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 253: | \[{20^{253}-1\over19}\] | 691 × 1381 × 1376321 × 107749972661<12> × 10778947368421<14> × 55581069160850861<17> × 9749241054463220311<19> × 46266279097921483078651<23> × [199199406899349704800145683447943580807269985050032038242019855025953796085624019433224930854643399354833042044396718381820579528050784121703519246552591189392148207230753986163963532628445462773754654770190603931392862005595557861931<234>] |