A057303 - OEIS

A057303

Numbers n such that the number of distinct digits in n is a digit of n.

1, 11, 12, 20, 21, 23, 24, 25, 26, 27, 28, 29, 32, 42, 52, 62, 72, 82, 92, 103, 111, 112, 121, 122, 123, 130, 132, 134, 135, 136, 137, 138, 139, 143, 153, 163, 173, 183, 193, 200, 202, 203, 211, 212, 213, 220, 221, 223, 224, 225, 226, 227, 228, 229, 230, 231

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OFFSET

1,2

COMMENTS

The repunits (A000042) are a subsequence. Analogous in construction to the refactorable numbers (A033950).

REFERENCES

S. Colton, Unpublished PhD Thesis, University of Edinburgh, 2000.

LINKS

Table of n, a(n) for n=1..56.

S. Colton, Refactorable Numbers - A Machine Invention, J. Integer Sequences, Vol. 2, 1999, #2.

S. Colton, HR - Automatic Theory Formation in Pure Mathematics

EXAMPLE