The next number could be 26
The next number could be 12
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The next number that is in the sequence is 12.
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6 12 9 18 15 30 27 54 51
Every next number is increased by 5. The next number in the sequence is 23.
The next number is 0
25 is the next number that appears in that sequence.
The next number in the sequence is 18. It's +1, +2, +3, +4, ....