n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 149: | \[149!!+1\] | 24 × 151 × 4597 × 7457561 × 1457603248262771833<19> × 576850975041149922716289786659857601<36> × 875307813894477354949651399671417737594606561835618263249573101<63> |