'Thirty' in the Bible

And the men of Ai smote of them about thirty and six men; and they chased them from before the gate even unto Shebarim, and smote them at the descent; and the hearts of the people melted, and became as water.

So Joshua arose, and all the people of war, to go up to Ai: and Joshua chose out thirty thousand men, the mighty men of valor, and sent them forth by night.

the king of Tirzah, one: all the kings thirty and one.