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Self-describing numbers: Difference between revisions
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An integer is said to be "self-describing" if it has the property that, when digit positions are labeled 0 to N-1, the digit in each position is equal to the number of times that that digit appears in the number.
For example, '''2020''' is a four-digit self describing number:
* position 0 has value 2 and there are two 0s in the number;
* position 1 has value 0 and there are no 1s in the number;
* position 2 has value 2 and there are two 2s;
* position 3 has value 0 and there are zero 3s.
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Self-describing numbers < 100.000.000 are: 1210, 2020, 21200, 3211000, 42101000.
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