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A181058 a(n) = prime(Fibonacci(phi(n))), where prime = A000040, Fibonacci = A000045 and phi = A000010. 1
2, 2, 2, 2, 5, 2, 19, 5, 19, 5, 257, 5, 827, 19, 73, 73, 7793, 19, 23159, 73, 827, 257, 196687, 73, 67931, 827, 23159, 827, 4528949, 73, 12717703, 7793, 67931, 7793, 563987, 827, 274253209, 23159, 563987, 7793, 2088145739, 827, 5738374519, 67931 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Phi is Euler's totient function A000010.

LINKS

Table of n, a(n) for n=1..44.

FORMULA

a(n) = A000040(A065451(n)) = A030427(A000010(n)). - Antti Karttunen, Dec 06 2017

EXAMPLE

a(7) = 19 since prime(fib(phi(7))) = prime(fib(6)) = prime(8) = 19 that is the 8th prime.

MATHEMATICA

f[n_] := Prime@ Fibonacci@ EulerPhi@ n; Array[f, 44] (* Robert G. Wilson v, Oct 02 2010 *)

PROG

(PARI) A181058(n) = prime(fibonacci(eulerphi(n))); \\ Antti Karttunen, Dec 06 2017

CROSSREFS

Cf. A000010, A000040, A000045, A030427, A065451, A181056.

Sequence in context: A107604 A080647 A324516 * A301452 A322788 A337082

Adjacent sequences:  A181055 A181056 A181057 * A181059 A181060 A181061

KEYWORD

nonn

AUTHOR

Carmine Suriano, Oct 01 2010

EXTENSIONS

More terms from Robert G. Wilson v, Oct 02 2010

STATUS

approved

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Last modified December 5 06:52 EST 2021. Contains 349543 sequences. (Running on oeis4.)