Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
230: | \[{20^{230}-1\over19}\] | 3 × 7 × 11 × 47 × 61 × 251 × 461 × 691 × 1381 × 3221 × 152381 × 563041 × 15899671 × 393682721 × 711976961 × 1187631911 × 2171940587581<13> × 3274400525856244223<19> × 46266279097921483078651<23> × 7938685883284687902899551<25> × 10777723802249858892664012252630187395225251961<47> × 7121307273752901983750606756745314224670092894931<49> × 423482815190164773087754922424574131424226119864444877189501<60> |