Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 220: | \[{31^{220}-1\over30}\] | 26 × 5 × 112 × 13 × 23 × 37 × 41 × 181 × 397 × 617 × 661 × 2531 × 2729 × 11551 × 17351 × 21821 × 78101 × 171161 × 208121 × 757241 × 150332843 × 167767051 × 806753201 × 1048563011 × 4707206941<10> × 355802443222817085661<21> × 245911396799577828131028569<27> × 4221639917326273950250434974921<31> × 60475444137117656048350023067938912608602841<44> × 24106981477091678423113880081946849059226586740161<50> × 236661696642275153056980146191674776616380367693641<51> |