What are the 7 key signature formula's?
Music I Piano

I don't know exactly of what you are asking for but, There are seven sharps, F sharp, C sharp, G sharp, D sharp, A sharp, E sharp and B sharp,  and seven flats, B flat, E flat, A flat, D flat, G flat, C flat and F flat, that is the order that they are placed on a music sheet on both treble and bass clef.