Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 172: | \[{31^{172}-1\over30}\] | 26 × 13 × 37 × 173 × 146982701137<12> × 2337025631729<13> × 123710288494287399090741372553<30> × 3049055684506560663410351046998584180840895763387409<52> × 2428604265313757770804574128250982331185007279645995324037847<61> × 649922096124328220863135765618962771983833603047554688254172753908883650422073164553<84> |