Astanga Hrudaya
त्रीनेव समया वृद्ध्या, षडेकस्यातिशायने। त्रयोदश समस्तेषुहषड् द्व्येकातिशयेन तु॥७५॥
they are 13 in combination of all three together - 6 with preponderance of any one dosha, 1 with equal preponderance of all the three, 6 by disproportionate subdivisions;
english translation
trIneva samayA vRddhyA, SaDekasyAtizAyane। trayodaza samasteSuhaSaD dvyekAtizayena tu॥75॥
hk transliteration by Sanscript