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EXAMPLE
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a(n) n {the digits reached}
1 1 {1}
112 2 {2, 4}
139 3 {8, 4, 7}
219 4 {8, 2, 4, 6}
373 5 {1, 2, 4, 6, 8}
719 6 {0, 2, 4, 6, 8, 9}
1133 7 {0, 2, 4, 6, 7, 8, 9}
1919 8 {0, 2, 4, 5, 6, 7, 8, 9}
3377 9 {0, 2, 3, 4, 5, 6, 7, 8, 9}
17117 10 {0, 1, 2, 3, 4, 5, 6, 7, 8, 9}
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