n!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 256: | \[256!!!+1\] | 9769 × 2936429 × 9343527932097303787469794925339<31> × 186362662144620266059414521326832438761965234508922978148636762937100436748626225709587270808678350357869779090356330869261465959<129> |