n!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 266: | \[266!!!!+1\] | 2269 × 111555838295134006039736434687<30> × 2816599655158174504512805035689020297<37> × 76646778921427207303845559950513502454556967889795097265223594611<65> |