n!!!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
* 271: | \[271!!!!-1\] | 23 × 449 × 673 × 8184826619<10> × [3098613448563920748290417032043788243973915903236689680376841274463933086914328236410342082927837636191424217178674968531<121>] |