n!!!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 255: | \[255!!!!-1\] | 27 × 757 × 1550167 × 32077489 × 2581710325524245416139554301271366945103575976472601824126106640894901854201322465328814209753818856499281763<109> |