3 5 15 75 1125
Assuming the following reasoning is correct:
3x5=15
5x15=75
15x75=1125
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The next number in the sequence 3-15-6-30-21 is -207.
The answer is 75. Starting at 10 the sequence is times 3, divided by 2, plus 1, times 3, divided by 2, plus 1. So the next number is times 3 = 75.
28
Times 3, cut in half, plus 1. The next number is 75.
63, 102, 165...