Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 408: | \[{28^{408}-1\over27}\] | 3 × 5 × 13 × 29 × 103 × 137 × 157 × 239 × 271 × 409 × 613 × 757 × 2347 × 2857 × 7321 × 8807 × 33049 × 47221 × 57427 × 108529 × 302329 × 614657 × 51605161 × 561870469 × 809119897 × 45508138747<11> × 3477048123497017<16> × 8061059901399457<16> × 148020807352107352204781<24> × 412037760199357579738273<24> × 5407933749161794928137748158777<31> × 57416576946400221758622504399097<32> × 4493911532793397608107303677360753164689<40> × 2890969080424846450614565391274481076384329<43> × 21099744001697087505351553822406156421454436701<47> × 258893502975564514605905427082533769723447792874488735287118938218501005069483477<81> × 2109878330004073108695362709594634584375620464560984052725071821499189269904561842011292185446986464363689285143747783834270256105267641<136> |