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1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91, 105, 120, 136, 153, 171, 190, 210, 231, 253, 276, 300, 325, 351, 378.

There are 27 of them under 400.

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Q: What are the triangular numbers between 1 and 400?
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