That sequence consists of the values of the polynomial x4-x2-5x, starting at x=2. The next few values (for x=8 to 12) are 3992, 6435, 9850, 14465 and 20532.
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its +2, +2, -1... so the next is 10
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Normally it is S in the alphabet
Oh, dude, it's like a math riddle or something. So, if we look at the pattern, it's subtracting 400, then adding 600, then subtracting 300. So, the next step would be to add 400, which would give us 500. Math can be fun, right?
The next number is 20.