Base 21 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 245: | \[{21^{245}-1\over20}\] | 5 × 43 × 631 × 1471 × 3319 × 7057 × 40841 × 126421 × 4149601 × 20028751 × 335157061 × 145699610071<12> × 1606344741163<13> × 1767442850839<13> × 421503321597121<15> × 1169880551952935810191<22> × 1703751007820049542146461103<28> × 188006995666967564810953567125575626049097225986967334127313862883944396398758097893518464439526269329357904095191701858257992684301210883123462331255243208778648370224149384241<177> |