Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 295: | \[{21^{295}-1\over20}\] | 5 × 40841 × 896447 × 334217419 × 1058225818572931<16> × 47540111129611360301<20> × 99418152769178987769191<23> × 3599933694931243085497791696053868938364103<43> × [51480545814730477131462170485603986718664597234555112257030142135067732411980008619505601289842656768327181369927654535085012123219907525920986418852156902006817412543340205460111137966575074966498147541552498954880456326888709649465162492152658058811609212957385223501<269>] |