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self-descriptive number

self descriptive number
Type of Math Object: 
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11A63 no label found


I'm not entirely sure d_x = \sum_{d_i = x} is correct. I understand what it means (digit y at position x is the total number of instances of digit y in the number) but I'm not sure if the formula is mathematically correct. Can this be fed to a CAS so that it understands what is meant?

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