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A239465
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a(n) is the least k such that e(k) = n, where e(k) is the smallest m > 1 such that k^m contains all the digits of k with at least the same multiplicity.
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0
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1, 4, 14, 2, 15, 19, 26, 118, 128, 1388, 18588, 111143, 11721111115
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OFFSET
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2,2
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COMMENTS
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10^12 < a(15) <= 33333333333338.
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LINKS
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EXAMPLE
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a(3) = 4 because e(1) = 2 (1^2 = 1), e(2) = 5 (2^5 = 32), e(3) = 5 (3^5 = 243) and finally e(4) = 3 (4^3 = 64).
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MATHEMATICA
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e[k_] := Block[{m=2, d = DigitCount@k}, While[Min[DigitCount[k^m] - d] < 0, m++]; m]; a[n_] := Block[{k=1}, While[e[k] != n, k++]; k]; a /@ Range[2, 11]
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CROSSREFS
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KEYWORD
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nonn,base,hard,more
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AUTHOR
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STATUS
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approved
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