Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 208: | \[{31^{208}-1\over30}\] | 28 × 132 × 17 × 37 × 53 × 409 × 1129 × 17863 × 42407 × 2426789 × 7908811 × 116337521 × 25085030513<11> × 76037563733<11> × 6060328173121<13> × 42716694944587<14> × 101686136508893<15> × 305688893141113<15> × 5603212901768856193<19> × 224721202412918666334576819250523191369<39> × 24447050282908296563870818732181703345691103738234473692434128302279568268515620830737993918945586557552868554424316613507377654721<131> |