SOLUTION: John likes 400 but not 300, he likes 100 but not 99, he likes 3600 but not 3700. What number does John like ?

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Question 1337: John likes 400 but not 300, he likes 100 but not 99, he likes 3600 but not
3700. What number does John like ?
Answer by khwang(438) About Me  (Show Source):
You can put this solution on YOUR website!
400, 100 and 600 are square of 20, 10 and 60,repectively.
While 300,99 and 3700 are not.
So, John likes square numbers (perfect numbers) ie the form n^2 for
some natural number n.