There are nine one-digit numbers from 1 to 50. These numbers are 1, 2, 3, 4, 5, 6, 7, 8, and 9. All other numbers in that range are two digits or greater.
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None. 3 digit numbers are not divisible by 19 digit numbers.
With 123 digits you can make 123 one-digit numbers.
None. The sum of one digit can't be twice the size of the digit.
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