Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 99: | \[{31^{99}-1\over30}\] | 32 × 23 × 199 × 331 × 397 × 617 × 991 × 3637 × 81343 × 204733 × 150332843 × 36093579787<11> × 294573316951<12> × 215792743120601131<18> × 3763784187326467459<19> × 869535983092745596321<21> × 650141690025315305584300036801<30> |