Seems like most of the disagreement in the comments here are due to people having different notions of the word octave. This should be no surprise as there are

Seems like most of the disagreement in the comments here are due to people having different notions of the word octave. This should be no surprise as there are numerous interpretations of the word according to Merriam-Webster: 1: an 8-day period of observances beginning with a festival day 2a: a stanza of eight lines : OTTAVA RIMA b: the first eight lines of an Italian sonnet 3a: a musical interval embracing eight diatonic degrees b: a tone or note at this interval c: the harmonic combination of two tones an octave apart d: the whole series of notes, tones, or digitals comprised within this interval and forming the unit of the modern scale e: an organ stop giving tones an octave above those corresponding to the keys 4: the interval between two frequencies (as in an electromagnetic spectrum) having a ratio of 2 to 1 5: a group of eight So maybe everyone's right.