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6
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What is the missing number in this logical series? 1, 2, 6, 42, 1806,______???? Its 3263442, you square the number then add the original unsquared number to the squared value, and so forth.
120. The numbers are factorials: 1, 1x2, 1x2x3, etc.
There is nothing missing here. If you are asking what end numbers are are missing in the front is 6 and in the very back is 9.