Samatha Only Wisdom

Can we gain wisdom(**panna or prajna**) with only one pointed concentration on a concept? I've heard it said that it takes mindfulness on "what actually is" instead of a concept that doesn't exist. Samatha, at least temporarily, lessons the defilements so why wouldn't concentration meditation be able to show one panna? Can one gain panna without seeing the three characteristics? Can one see the three characteristics with Samatha by itself? Can we reach Nirvana with just Samatha?