Strong's numbers

μετανοέω G3340

metanoéō

met-an-o-eh'-o

from μετά and νοιέω; to think differently or afterwards, i.e. reconsider (morally, feel compunction):--repent.

μετα-νοέω, -ῶ, [in LXX for נחם ni., I Ki 15:29, Je 4:28, al.;]

to change one's mind or purpose, hence, to repent; in NT (exc. Lk 17:3, 4), of repentance from sin, involving amendment: seq. ἀπό, Ac 8:22; ἔκ, Re 2:21, 22 9:20, 21 16:11 (מִן שׁוּב); ἐπί, II Co 12:21; absol., Mt 3:2 4:17 11:20 12:41, Mk 1:15 6:12, Lk 11:32 13:3, 5 15:7, 10 16:30 17:3, 4, Ac 2:38 3:19 17:30 26:20 Re 2:5, 16, 21 3:3, 19; c. inf., Re 16:9; ἐν σάκκῳ κ. σποδῷ, Mt 11:21, Lk 10:13.†

From G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922), in the public domain.

Shown in the King James Version (KJV), whichever translation you read in — it is the text these numbers are tagged against.

Matthew 3:2
And saying, Repent ye: for the kingdom of heaven is at hand.
Matthew 4:17
From that time Jesus began to preach, and to say, Repent: for the kingdom of heaven is at hand.
Matthew 11:20
Then began he to upbraid the cities wherein most of his mighty works were done, because they repented not:
Matthew 11:21
Woe unto thee, Chorazin! woe unto thee, Bethsaida! for if the mighty works, which were done in you, had been done in Tyre and Sidon, they would have repented long ago in sackcloth and ashes.
Matthew 12:41
The men of Nineveh shall rise in judgment with this generation, and shall condemn it: because they repented at the preaching of Jonas; and, behold, a greater than Jonas is here.
Mark 1:15
And saying, The time is fulfilled, and the kingdom of God is at hand: repent ye, and believe the gospel.
Mark 6:12
And they went out, and preached that men should repent.
Luke 10:13
Woe unto thee, Chorazin! woe unto thee, Bethsaida! for if the mighty works had been done in Tyre and Sidon, which have been done in you, they had a great while ago repented, sitting in sackcloth and ashes.
Luke 11:32
The men of Nineve shall rise up in the judgment with this generation, and shall condemn it: for they repented at the preaching of Jonas; and, behold, a greater than Jonas is here.
Luke 13:3
I tell you, Nay: but, except ye repent, ye shall all likewise perish.