I want to get a tattoo that lasts more than 5 weeks?

I've heard about airbrush and henna tattoos, but also I heard something about an ink that lasts until 5 weeks, I don't remember the name, could anybody help me out and tell me the name of it and where I can get one in Los Angeles CA??? And in case such ink doesn't exist could anybody tell where I can get henna tattoo in Los Angeles, CA, something not too expensive but that I get satisfied PLEASE COMMUNITY!!! THX!!!