'Thirty' in the Bible

Now from the time when I was made ruler of the people in the land of Judah, from the twentieth year till the thirty-second year of Artaxerxes the king, for twelve years, I and my servants have never taken the food which was the right of the ruler.

The children of Senaah, three thousand, nine hundred and thirty.

The door-keepers: the children of Shallum, the children of Ater, the children of Talmon, the children of Akkub, the children of Hatita, the children of Shobai, a hundred and thirty-eight.

As well as their men-servants and their women-servants, of whom there were seven thousand, three hundred and thirty-seven; and they had two hundred and forty-five men and women to make music.

They had seven hundred and thirty-six horses, two hundred and forty-five transport beasts;

Four hundred and thirty-five camels, six thousand, seven hundred and twenty asses.

And some of the heads of families gave money for the work. The Tirshatha gave into the store a thousand darics of gold, fifty basins, five hundred and thirty priests' robes.

But all this time I was not at Jerusalem: for in the thirty-second year of Artaxerxes, king of Babylon, I went to the king; and after some days, I got the king to let me go,