n!!!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 260: | \[260!!!!+1\] | 131 × 111427 × 22476050928460068314840131525289004188209038139<47> × 34217474256180256869112086307876561503806567392678375712395680574933023798107<77> |