n!!!!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
280: | \[280!!!!!-1\] | 5347 × 1175868787 × 16625684489<11> × 18991869525527443<17> × 497018646121090188681267134208335088425252867432031884790492837321761882533<75> |