Writing it as:
1, 4, 9, 1 6, 2 5, 3 6, 4 9, 6 4, 8 1, ...
Should help you spot it is the digits of the square numbers written out in order.
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1, 4, 16, and 64 is a pattern. It multiplies by 4 each time. The next number would be 256.
Yes.
The factors of 16 are 1, 2, 4, 8 and 16. I don't know which one is missing.
1, 2, 4, 8, 16
16 is a multiple of 1 because 1 x 16 = 16 16 is a multiple of 4 because 4 x 4 = 16 16 is a multiple of 16 because 16 x 1 = 16 16 is the LCM of that set of three numbers because there is no smaller number that is a multiple of those three.