Base 7 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 86: | \[{7^{86}-1\over6}\] | 23 × 947 × 19867 × 20899 × 163573 × 235211 × 3799051 × 4749781 × 166003607842448777<18> × 2192537062271178641<19> |