n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
179: | \[179!!+1\] | 22 × 199 × 21211 × 860861 × 1085985353 × 335101174493<12> × 18768611016434053<17> × 706173947837694524180838224807<30> × 66101226728053563671437626464627998246651<41> × 23570864856783981322699156899474984790852729<44> |