'Thirty' in the Bible

Also, from the day that he appointed me to be their governor in the land of Judah, from the twentieth year even unto the thirty and second year of Artaxerxes the king -- twelve years -- I, and my brethren, the bread of the governor have not eaten:

Sons of Senaah: three thousand nine hundred and thirty.

The gatekeepers: sons of Shallum, sons of Ater, sons of Talmon, sons of Akkub, sons of Hatita, sons of Shobai: a hundred thirty and eight.

apart from their servants and their handmaids -- these are seven thousand three hundred thirty and seven; and of them are singers and songstresses, two hundred forty and five.

Their horses are seven hundred thirty and six; their mules, two hundred and forty and five;

camels, four hundred thirty and five; asses, six thousand seven hundred and twenty.

And from the extremity of the heads of the fathers they have given to the work; the Tirshatha hath given to the treasure, of gold, drams a thousand, bowls fifty, priests' coats thirty and five hundred.

And during all this I was not in Jerusalem, for in the thirty and second year of Artaxerxes king of Babylon did I come unto the king, and at the end of days I have asked of the king,