@Berzerker I read your link. Lots dubiously valuable math. But even if you accept the math, the author's goal has nothing to do with genesis and 120 year life spans/reigns and doesn't bring that up at all. He is trying to prove:
This link is also of the antediluvian kings. The names and numbers don't match up to your list. Could both be wrong?
Complete Mesopotamian Kings List | Mesopotamian Gods & Kings
More details from your link:
Hence the list of antediluvian kings of the Isin Dynasty is an encoding of astronomical data concerning the various lunar periods.
This link is also of the antediluvian kings. The names and numbers don't match up to your list. Could both be wrong?
Complete Mesopotamian Kings List | Mesopotamian Gods & Kings
More details from your link:
Taking up again the numbers of Berossus' list, and working out the sum of the products of the reigns by city (Babylon, Shuruppak and Pautibiblon, Larak) the results are: [(10 + 3) X 18] + [(13 + 12 + 18 + 10 + 18) X (10 + 8)], which equals 1512.
Berossus also indicates that Alaparos was the son of Aloros, and Xisouthros the son of Otiartes. Calculating the sum of the products of the reigns two by two, and merging the duration of the reigns relative to Alaparos-Aloros and Xisouthros-Otiartes, the results are: [(10 +3) X (8 + 18)] + (13 X 10) + (12 X 18) + (18 X 10), which equals 864.
These numbers, 1512 and 864, are both multiples of 216.
1512 is equal to 216 X 7 (7 being the number of days in the week), and 864 is equal to 216 X 4 (4 being the number of seasons in the year, or the number of weeks in the lunar month). Hence, the introduction of the week of seven days, attested later, may have been conceptualized in this earlier epoch.
What is more, the number 216, equal to 18 (= cycle of saros) times 12 (= months in the solar year), but also 8 X 27 (= days in the solar month), or even 235 (= lunar cycles) - 19 (= solar years), could be the key to understanding the important astronomical discovery of the coincidence of lunar and solar cycles.