n# + 1
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
77: | \[389\#+1\] | 216401 × 4415819 × 906077190456575539<18> × 10669413458040805850326048267921760092515382728179813<53> × 27733496045762922142051419479704819584173109031160910622157943354740597972687<77> |