Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
52: | \[{31^{52}-1\over30}\] | 26 × 132 × 37 × 53 × 17863 × 42407 × 2426789 × 7908811 × 116337521 × 76037563733<11> × 42716694944587<14> × 101686136508893<15> |