There are (not counting 1) three square numbers between 1 and 20.
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The only square number between 20 and 30 is 25.
36 is the only square number that is also a triangular number between 20 and 40.
Any number between 20 and 22.36
17The prime numbers between 10 and 20 are 11, 13, 17 and 19. There is only one square number between 10 and 20: 16. Using the criteria given, the number that fits is 17.
1 and 4