n!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 122: | \[122!!-1\] | 6159021917<10> × 39623912938769<14> × 79006057278326931079<20> × 11525348203681986873349807301<29> × 5266848973457329254494145241897<31> |