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A072076
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Largest k such that EulerPhi(k) = 10^n.
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3
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2, 22, 250, 3750, 41250, 414150, 4166250, 42281250, 438281250, 4400343750, 44266406250, 449238281250, 4510352343750, 45373066406250, 455545586718750, 4555455867187500, 45555287544813750, 455552875448137500, 4566844506855468750, 45668445068554687500
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OFFSET
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0,1
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LINKS
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Ray Chandler, Table of n, a(n) for n = 0..1000
Max A. Alekseyev, Computing the Inverses, their Power Sums, and Extrema for Euler's Totient and Other Multiplicative Functions. Journal of Integer Sequences, Vol. 19 (2016), Article 16.5.2
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FORMULA
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a(n) = Max{k; A000010(k) = 10^n}.
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EXAMPLE
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n=3: a(3)=3750 because InvPhi(1000) = {1111, 1255, 1375, 1875, 2008, 2222, 2500, 2510, 2750, 3012, 3750}.
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CROSSREFS
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Cf. A000010, A014197, A014573, A072074, A072075, A110076.
Sequence in context: A342232 A082777 A229465 * A226706 A036841 A307852
Adjacent sequences: A072073 A072074 A072075 * A072077 A072078 A072079
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KEYWORD
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nonn
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AUTHOR
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Labos Elemer, Jun 13 2002
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EXTENSIONS
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More terms from Max Alekseyev, Apr 26 2010
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STATUS
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approved
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