The Five Prime Scales

(as per Andrew Milne)

diatonic w - w - h - w - w - w - h

harmonic minor w - h - w - w - h - +2 - h

harmonic major w - w - h - w - h - +2 - h

melodic w - h - w - w - w - w - h

double harmonic h - +2 - h - w - h - +2 - h