1 2 2 6 3 12 4 20 5 30 6 42 7 56 8 72 9 90 10
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92 - 18 = 72 72 - 16 = 56 56 - 14 = 42 42 - 12 = 30 30 - 10 = 20 20 is the next number in the sequence.
The number which best completes the sequence below is 20 5 30 6 42 7
56
56 (just the next number, not the number that completes the sequence)
56