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 A278350 Cototient of Fibonacci(n). 0
 0, 0, 1, 1, 1, 4, 1, 9, 18, 15, 1, 96, 1, 41, 370, 435, 1, 1432, 149, 3565, 5906, 287, 1, 33696, 15025, 753, 106562, 129651, 1, 544040, 2973, 960597, 1782178, 5167, 2413385, 10534320, 501497, 1397033, 31758946, 60862155, 62157, 149373496, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,6 COMMENTS a(n) = 1 if Fibonacci(n) is prime. LINKS FORMULA a(n) = A051953(A000045(n)). a(n) = A000045(n) - A065449(n) for n > 0. MATHEMATICA Table[Fibonacci[n] - EulerPhi[Fibonacci[n]], {n, 40}] (* Alonso del Arte, Nov 21 2016 *) PROG (PARI) a(n) = fibonacci(n) - eulerphi(fibonacci(n)); CROSSREFS Cf. A000045, A051953, A065449. Sequence in context: A075150 A001254 A143763 * A128626 A193963 A028941 Adjacent sequences:  A278347 A278348 A278349 * A278351 A278352 A278353 KEYWORD nonn AUTHOR Altug Alkan, Nov 19 2016 STATUS approved

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Last modified January 20 03:25 EST 2022. Contains 350467 sequences. (Running on oeis4.)