Ramanujan’s Last Formula

When I gave a talk about Ramanujan’s easiest formula at the Whittier College math club run by my former student Brandon Coya, one of the students there asked a great question: are there any unproved formulas of Ramanujan left?

So I asked around on MathOverflow, and this is the result:

George Andrews and Bruce Berndt have written five books about Ramanujan’s lost notebook, which was actually not a notebook but a pile of notes Andrews found in 1976 in a box at the Wren Library at Trinity College, ...