n!!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 266: | \[266!!!!!+1\] | 2476561 × 3256621 × 1074625357109<13> × 13224303942703896150591106606949955583929999454056338550085761548760171816006358433<83> |