'Seventy seven' in the Bible

If Cain shall be avenged seven fold, truly Lamech seventy-seven fold.

And all the days of Lamech were seven hundred seventy-seven years, and he died.

And he caught a young man of the men of Succoth, and inquired of him. And he described for him the rulers of Succoth, and the elders of it, seventy-seven men.

The sons of the captivity, who came out of exile, offered burnt-offerings to the God of Israel, twelve bullocks for all Israel, ninety-six rams, seventy-seven lambs, twelve he-goats for a sin-offering. All this was a burnt-offering