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A197219 a(n) = Lucas(phi(n)). 4
2, 1, 1, 3, 3, 7, 3, 18, 7, 18, 7, 123, 7, 322, 18, 47, 47, 2207, 18, 5778, 47, 322, 123, 39603, 47, 15127, 322, 5778, 322, 710647, 47, 1860498, 2207, 15127, 2207, 103682, 322, 33385282, 5778, 103682, 2207, 228826127, 322, 599074578, 15127, 103682, 39603 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..200

FORMULA

a(n) = A000032(A000010(n)).

MATHEMATICA

Table[LucasL[EulerPhi[n]], {n, 0, 50}]

PROG

(MAGMA) [2], [Lucas(EulerPhi(n)): n in [1..60]]; // Vincenzo Librandi, Oct 13 2011

(PARI) for(n=0, 30, print1(if(n==0, 2, fibonacci(eulerphi(n)+1) + fibonacci(eulerphi(n)-1)), ", ")) \\ G. C. Greubel, Dec 22 2017

CROSSREFS

Cf. A000010, A000032, A065449, A065451, A197218 (phi(Lucas(n))).

Sequence in context: A219876 A216655 A242884 * A300508 A120013 A151847

Adjacent sequences:  A197216 A197217 A197218 * A197220 A197221 A197222

KEYWORD

nonn

AUTHOR

T. D. Noe, Oct 12 2011

STATUS

approved

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Last modified January 26 11:07 EST 2020. Contains 331279 sequences. (Running on oeis4.)