Notes: C, D, E, G, and A - Key: C - Category: Hexatonic Scales
The C Ionian Pentatonic uses six notes per octave. Because of this same reason it is a member of the so called Hexatonic -scales that have Six-note (or Six-tone). On the piano keyboard, it is made up of no black keys: no and five white keys: C, D, E, G, and A. This combination makes this scale - as well as the C Prometheus, C Prometheus Liszt, and C Prometheus Neapolitan - as great choices for composing or improvising music.
If we take a look a the key signature of the C Ionian Pentatonic Scale we can find it has no flats and no sharps. Therefore, on sheet music you will find no accidentals on the score. The notes of this scale are: C, D, E, G, and A.