What is the next number in this sequence 3, 6, 10, 15, _?

 Answers =   Sure, here are the next few numbers in the sequence:

21, 28, 36, 45, 55, 66, 78, 91, 105, 120, 136, 153, 171, 190, 210, 231, 253, 276, 300, 325, ...

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