'Seventy seven' in the Bible

He captured a young man of Succoth and questioned him. And the youth wrote down for him [the names of] the leaders of Succoth and its elders, seventy-seven men.

Also the [former] exiles who had come from the captivity offered burnt offerings to the God of Israel: 12 bulls for all Israel, 96 rams, 77 lambs, and 12 male goats for a sin offering. All this was a burnt offering to the Lord.