Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
54: | \[{31^{54}-1\over30}\] | 25 × 33 × 72 × 19 × 109 × 163 × 331 × 541 × 577 × 3637 × 6427 × 81343 × 1538083 × 18880993 × 599329963 × 1836205027201<13> × 126901881805771<15> |