Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
134: | \[{21^{134}-1\over20}\] | 2 × 11 × 269 × 278051 × 324363426169571<15> × 312929837239650768379490219650039<33> × 71028332352256443443129296219339913167<38> × 6340822630701755986496764672651013784788497018816491797711071984283214713483666711<82> |