n!!!! - 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
280: | \[280!!!!-1\] | 163 × 2889547 × 1453902497 × 24381014845798440483129562250799367637640231187268838596534527647651145691806330886816677229871185910404405340173775412343647<125> |