Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 145: | \[{31^{145}-1\over30}\] | 5 × 11 × 349 × 10789 × 17351 × 49823 × 140071 × 359311 × 1482570191 × 11242578713<11> × 189343400041<12> × 2072290057537560641738346355006152674531385030387423985089132613681629201006464958199227327851361173313065081572608821582565271654355588546758175279751924601<157> |