Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 486: | \[{31^{486}-1\over30}\] | 25 × 35 × 72 × 19 × 109 × 163 × 331 × 487 × 541 × 577 × 1621 × 2593 × 3637 × 3889 × 4861 × 6427 × 11503 × 13933 × 81343 × 477739 × 516619 × 1538083 × 6757669 × 7822981 × 18880993 × 599329963 × 1836205027201<13> × 126901881805771<15> × 3170561214600937<16> × 250520096864154277<18> × 20561538346557397039189<23> × 3636085676457841485097717<25> × 281025407208902787266470275952437229<36> × 124796720050174992115146031610052568212932455637390989<54> × [21782584364571673053514203267953824755100348874567985903621407935062472498845807929861580740040160796526495474521535149432700591234363500006579626963526335794687043598229254392626137788214449<191>] × [5613304015221238650989345408115169728199318104788328263418799435277990188026503844048989438839623445778627214798080979832017525905151665131264562400309274027855973361149028689492646639508598330741145391379121436835105218497540859640833<235>] |