Base 20 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 393: | \[{20^{393}-1\over19}\] | 421 × 3931 × 14149 × 28559 × 88634252851<11> × 5394745684609<13> × 42826820062834429<17> × 87138888519025909<17> × 252120378038449951<18> × 31223409425391818235963919<26> × 7828769974104026860693944259<28> × 17358908895752663637684695959931846281734452761<47> × 989211218764465041890284072238784671227769462489155618721<57> × [840789229505177153590625837100748361780701128661471948511529501151602469425821748500742236929205459805725163418362113868294442631853121912483702809985626639807215129414822825956969103307611864124635515024030388343823496685892355474394213412401893966237899601713369<264>] |