Base 18 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| * 323: | \[{18^{323}-1\over17}\] | 17 × 647 × 6841 × 6089884909802812423<19> × 7563707819165039903<19> × 1224776317481598387281<22> × 77817515484293963353575683599<29> × [505381644687472048978946632505644778919090658411993333909416829075306269074344723772614736792536514489820064614679832160866049344683490469681981007697765155899030431525574645558537692517492581739755632449133407621320957896604705730182973733600517705979571939512681405054573002786311146604887329659540967071207<309>] |