**Exotic numbers: write n in base 10 as d_1 d_2 ... d_k; sequence gives numbers n which can be obtained by using the digits d_1 ... d_k exactly once, at most one each of the symbols +, -, x, "divided by", sqrt, factorial, ^, together with any number of parentheses.**

*1, 2, 24, 25, 36, 64, 7*

*1 seqfan posts*

Index of A-numbers in seqfan: by ascending order by month by frequency by keyword

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