Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 318: | \[{21^{318}-1\over20}\] | 2 × 11 × 107 × 421 × 463 × 1697 × 8693 × 12721 × 111803078830519<15> × 207612155793974069<18> × 372515213872960388437<21> × 4555268603071594349347155493<28> × 167223466685805761701453712891<30> × 3494212075791575531835909274237181<34> × 2018656483852209137639505692992077007<37> × 75685729452842223963000669830840612177358577<44> × 158879028706827226982727678188557736958029273812511839<54> × 3037451713432474400932625673133295540474905301493126041891458131292584055022708457334022733726545714777036708668750591663639<124> |