Base 28 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 290: | \[{28^{290}-1\over27}\] | 11 × 292 × 59 × 1451 × 40427 × 53951 × 637421 × 1074509 × 245681335071811<15> × 8177803045607381<16> × 15490614825662562881<20> × 25404189355843522469778697943<29> × 279071175543028128073558728091<30> × 582595509837473004489665028935473297399<39> × 3232214812371191632102003601479471938552047016991<49> × 8564349015947232687668921517733211608003456523101309174316471<61> × 1209169934795671335087605967265948132674062887032789276705259971341<67> × 3449077447784728200886088316998012928306799775565462040804360774331<67> |