1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Min. number of digits
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Max. number of digits
2 3 4 5 6 7 8 9 10 11 12 13 14 15 Number of numbers
1 2 3 4 5 10 20 30 50 Number of problems
1 2 3 4 5 6 7 8 9 : number of digits
1 2 3 4 5 : number of digits
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