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 A134787 Numbers n such that Fibonacci(prime(n)) is not prime. 20
 1, 8, 11, 12, 13, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26, 27, 28, 29, 30, 31, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 85, 86 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 MATHEMATICA k = {}; Do[If[ ! PrimeQ[Fibonacci[Prime[n]]], AppendTo[k, n]], {n, 1, 100}]; k Select[Range[90], !PrimeQ[Fibonacci[Prime[#]]]&] (* Harvey P. Dale, Oct 16 2016 *) PROG (Magma) [n: n in [1..100]| not IsPrime(Fibonacci(NthPrime(n)))]; // Vincenzo Librandi, Jan 18 2013 (PARI) is(n)=!isprime(fibonacci(prime(n))) \\ Charles R Greathouse IV, Feb 03 2014 CROSSREFS Cf. A050937, A090819. Sequence in context: A347313 A077060 A123939 * A249104 A191887 A122195 Adjacent sequences: A134784 A134785 A134786 * A134788 A134789 A134790 KEYWORD nonn,easy AUTHOR Artur Jasinski, Nov 12 2007 EXTENSIONS Definition corrected by N. J. A. Sloane, Nov 12 2007 STATUS approved

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Last modified April 23 06:04 EDT 2024. Contains 371906 sequences. (Running on oeis4.)