n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 155: | \[155!!-1\] | 2 × 1013 × 16145093 × 885623989 × 519740879921<12> × 686638866382276691771<21> × 2234420167327837286569<22> × 2914882222508489575979917948121<31> × 3241914900579462400268598670171643<34> |