Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Pythagorean tuning
Table title:
Pythagorean intervals
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=3 > Number of semitones </th><th colspan=4 rowspan=1 > Generic names </th><th colspan=3 rowspan=1 > Specific names </th></tr>
<tr> <th colspan=2 rowspan=1 > Quality and number </th><th colspan=2 rowspan=2 > Other naming conventions </th><th colspan=1 rowspan=2 > Pythagorean tuning </th><th colspan=1 rowspan=2 > 5-limit tuning </th><th colspan=1 rowspan=2 > 1/4-comma meantone </th></tr>
<tr> <th colspan=1 rowspan=1 > Full </th><th colspan=1 rowspan=1 > Short </th></tr>
<tr> <td colspan=1 rowspan=1 > 0 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=2 rowspan=1 > comma </td><td class="highlighted"  colspan=1 rowspan=1 > Pythagorean comma (524288:531441) </td><td colspan=1 rowspan=2 >  </td><td colspan=1 rowspan=2 > diesis (128:125) </td></tr>
<tr> <td colspan=1 rowspan=1 > 0 </td><td class="highlighted"  colspan=1 rowspan=1 > diminished second </td><td colspan=1 rowspan=1 > d2 </td><td class="highlighted"  colspan=1 rowspan=1 > (531441:524288) </td></tr>
<tr> <td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > minor second </td><td colspan=1 rowspan=1 > m2 </td><td colspan=1 rowspan=2 > semitone, half tone, half step </td><td colspan=1 rowspan=1 > diatonic semitone, minor semitone </td><td colspan=1 rowspan=1 > limma (256:243) </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 1 </td><td colspan=1 rowspan=1 > augmented unison </td><td colspan=1 rowspan=1 > A1 </td><td colspan=1 rowspan=1 > chromatic semitone, major semitone </td><td colspan=1 rowspan=1 > apotome (2187:2048) </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 2 </td><td colspan=1 rowspan=1 > diminished third </td><td colspan=1 rowspan=1 > d3 </td><td colspan=2 rowspan=2 > tone, whole tone, whole step </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 2 </td><td colspan=1 rowspan=1 > major second </td><td colspan=1 rowspan=1 > M2 </td><td colspan=2 rowspan=1 > sesquioctavum (9:8) </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 3 </td><td colspan=1 rowspan=1 > minor third </td><td colspan=1 rowspan=1 > m3 </td><td colspan=2 rowspan=1 >  </td><td colspan=1 rowspan=1 > semiditone (32:27) </td><td colspan=1 rowspan=1 > sesquiquintum (6:5) </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 4 </td><td colspan=1 rowspan=1 > major third </td><td colspan=1 rowspan=1 > M3 </td><td colspan=2 rowspan=1 >  </td><td colspan=1 rowspan=1 > ditone (81:64) </td><td colspan=2 rowspan=1 > sesquiquartum (5:4) </td></tr>
<tr> <td colspan=1 rowspan=1 > 5 </td><td colspan=1 rowspan=1 > perfect fourth </td><td colspan=1 rowspan=1 > P4 </td><td colspan=2 rowspan=1 > diatessaron </td><td colspan=2 rowspan=1 > sesquitertium (4:3) </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 6 </td><td colspan=1 rowspan=1 > diminished fifth </td><td colspan=1 rowspan=1 > d5 </td><td colspan=2 rowspan=2 > tritone </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 6 </td><td colspan=1 rowspan=1 > augmented fourth </td><td colspan=1 rowspan=1 > A4 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 7 </td><td colspan=1 rowspan=1 > perfect fifth </td><td colspan=1 rowspan=1 > P5 </td><td colspan=2 rowspan=1 > diapente </td><td colspan=2 rowspan=1 > sesquialterum (3:2) </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > 12 </td><td colspan=1 rowspan=1 > (perfect) octave </td><td colspan=1 rowspan=1 > P8 </td><td colspan=2 rowspan=1 > diapason </td><td colspan=3 rowspan=1 > duplex (2:1) </td></tr>
</table>
Question:
What is the quality number for this equation?
Answer:
The Pythagorean comma's size (524288:531441) is the reciprocal of the Pythagorean diminished second's size (531441:524288).