DANUBE 2010 Problem 1

Determine all integer numbers $n\ge 3$ such that the regular $n$ -gon can be decomposed into isosceles triangles by non-intersecting diagonals.

Dataset text AI-MO AoPS. Quoted with source.

Solutions

No solution is on olymmath yet. Official and human solutions come first when they arrive. AI solutions come after them, with a label.