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 A072076 Largest k such that EulerPhihi(k) = 10^n. 3
 2, 22, 250, 3750, 41250, 414150, 4166250, 42281250, 438281250, 4400343750, 44266406250, 449238281250, 4510352343750, 45373066406250, 455545586718750, 4555455867187500, 45555287544813750, 455552875448137500 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS 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 FORMULA a(n) = Max{k; A000010(k) = 10^n}. EXAMPLE n=3: a(3)=3750 because InvPhi(1000) = {1111, 1255, 1375, 1875, 2008, 2222, 2500, 2510, 2750, 3012, 3750}. CROSSREFS Cf. A000010, A014197, A014573, A072074, A072075, A110076. Sequence in context: A342232 A082777 A229465 * A226706 A036841 A307852 Adjacent sequences:  A072073 A072074 A072075 * A072077 A072078 A072079 KEYWORD nonn AUTHOR Labos Elemer, Jun 13 2002 EXTENSIONS More terms from Max Alekseyev, Apr 26 2010 STATUS approved

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Last modified September 17 19:06 EDT 2021. Contains 347489 sequences. (Running on oeis4.)