0
Anonymous
1, 10, 11, 12, 13, 14, 15, 16, 17, 18,19, 21, 31, 41, 51, 61, 71, 81, 91, 100 = 21 times
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As a digit in other numbers it appears 20 times
18 times
100 times greater.
11 times
19 times