Abbott-Smith Manual Greek Lexicon
ἑβδομηκοντάκις (G1441)
1 † ἑβδομηκοντάκις , adv. , [in LXX for שִׁבְעִים , Ge 4:24 * ;] seventy times : ἑ. ἑπτά , seventy times seven , Mt 18:22 (R, txt., ICC , in l.), or seventy-seven times (R, mg.; cf. M, Pr. , 98; WM, 314; Meyer, in l.).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain