qgis - One to many intersection of polygons

using QGIS 2.18.16 I am trying to figure out how to find out what polygons in layer one (blue) intersects the polygons in layer 2 (red\pink). I know that there will be more than one intersection for most of the polygons in layer 1 (blue) but not sure how to calc it. In a perfect world I would like to add it as a attribute to the polygon in layer 1.