Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 121: | \[{31^{121}-1\over30}\] | 23 × 397 × 617 × 150332843 × 11940367581816879572136129274223<32> × 9392227965461522501964516749350668265291929362892725821670821017434506431310698197489075859490493175968125885803892739326729461700207<133> |