Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 108: | \[{31^{108}-1\over30}\] | 26 × 33 × 72 × 13 × 19 × 37 × 109 × 163 × 331 × 541 × 577 × 3637 × 6427 × 81343 × 922561 × 1536553 × 1538083 × 18880993 × 599329963 × 512616735577<12> × 1836205027201<13> × 126901881805771<15> × 277477787226853<15> × 91556360840213317<17> × 19235533383829731610441<23> |