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Answer:
Without getting into the whole is zero a number or not debate, any of the numbers 0 to 9.
(If you consider zero to be not a number then it's 1 to 9).
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81 is.
6 is the only single digit perfect number.
There is no single digit number greater than 9. After 9 is 10, which is a double-digit number.
No, zero is not the smallest single didget number. There negative single digit number from -1 through -9
25811 is a single (5-digit) number and a single number does not define a sequence.