Base 31 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 129: | \[{31^{129}-1\over30}\] | 3 × 331 × 1190671 × 146982701137<12> × 5408368622183010019<19> × 3049055684506560663410351046998584180840895763387409<52> × 28268213368244207021067545104813760525436762850832706185611685178643757376267942042333476824202437189<101> |