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 A197218 a(n) = phi(Lucas(n)). 6
 1, 1, 2, 2, 6, 10, 6, 28, 46, 36, 80, 198, 132, 520, 560, 600, 2206, 3570, 1908, 9348, 12960, 11760, 25704, 63480, 50692, 150000, 180960, 208008, 609084, 1130304, 604800, 3010348, 4865280, 3920400, 8374344, 17836000, 13685760, 54018520, 58269200, 69600960 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS Amiram Eldar, Table of n, a(n) for n = 0..1000 (using Blair Kelly's data; terms 0..200 from Vincenzo Librandi) Blair Kelly, Fibonacci and Lucas Factorizations FORMULA a(n) = A000010(A000032(n)). MATHEMATICA Table[EulerPhi[LucasL[n]], {n, 0, 40}] PROG (Magma) [EulerPhi(Lucas(n)): n in [0..40]]; // Vincenzo Librandi, Oct 13 2011 (PARI) for(n=0, 30, print1(eulerphi(fibonacci(n+1) + fibonacci(n-1)), ", ")) \\ G. C. Greubel, Dec 22 2017 CROSSREFS Cf. A000010, A000032, A065449, A065451, A197219 (Lucas(phi(n))). Sequence in context: A321623 A077063 A081728 * A080460 A080456 A077017 Adjacent sequences: A197215 A197216 A197217 * A197219 A197220 A197221 KEYWORD nonn AUTHOR T. D. Noe, Oct 12 2011 STATUS approved

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Last modified June 14 05:27 EDT 2024. Contains 373393 sequences. (Running on oeis4.)