n!! + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
131: | \[131!!+1\] | 22 × 84443 × 929629 × 1141277 × 8173749391<10> × 17939204913051289639<20> × 7763542727546653873753071524119<31> × 6824575611267822258058659275773621<34> |