Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 155: | \[{31^{155}-1\over30}\] | 5 × 11 × 17351 × 117001441 × 14046004014701<14> × 608885028530064901<18> × 568972471024107865287021434301977158534824481<45> × 88896270609320385787641437577909568758714314649392078577877248449523670731636399552480684239666471170845978397240646698367972734999679359361<140> |