-2 is a single number. A single number is not sufficient to define a sequence.
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Prime number sequence.
Each subsequent number in this sequence is 2 less than the previous. It is extremely likely that the next number in this sequence is 2.
81 is a single 2-digit number. A single number cannot define a sequence.
As the sequence is going up, you multiply the previous number by 3 and add 2. Therefore, the next number in the sequence is equal to 161 x 3 + 2 = 425.
The 40th number in the sequence will be 40 x 4, or 160.Reasoning:Because the sequence is multiples of 4.The 1st number in the sequence is 1 x 4, or 4.The 2nd number in the sequence is 2 x 4, or 8...The 4th number in the sequence is 4 x 4, or 16...The 17th number in the sequence is 17 x 4, or 68