n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
145: | \[145!!+1\] | 2 × 63781 × 3577061 × 17163730291<11> × 18995720062919<14> × 28272835612453<14> × 83095676698753<14> × 851211909661129515006941<24> × 9354655794097336548318557649215784153493<40> |