n!!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 264: | \[264!!!!!+1\] | 5 × 277 × 17609 × 126329531184301169<18> × 221094521153549002856539<24> × 32395583781647364437412371<26> × 833744918792913983744365562672737<33> |