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 A090819 Primes p such that the p-th Fibonacci number is nonprime. 21
 2, 19, 31, 37, 41, 53, 59, 61, 67, 71, 73, 79, 89, 97, 101, 103, 107, 109, 113, 127, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Is it true that a(n) ~ n log n? - Charles R Greathouse IV, Aug 15 2015 LINKS Table of n, a(n) for n=1..49. EXAMPLE Fibonacci(37) = 24157817 = 73*149*2221. [corrected by Bobby Jacobs, Sep 25 2017] MATHEMATICA Select[Prime[Range[62]], ! PrimeQ[Fibonacci[#]] &] (* Jayanta Basu, Jul 10 2013 *) PROG (PARI) f(n) = forprime(x=2, n, p=fibonacci(x); if(!isprime(p), print1(x", "))) CROSSREFS Cf. A000045, A001605. Essentially the same as A038672. Sequence in context: A120276 A006962 A261312 * A254897 A059697 A103058 Adjacent sequences: A090816 A090817 A090818 * A090820 A090821 A090822 KEYWORD easy,nonn AUTHOR Cino Hilliard, Feb 11 2004 EXTENSIONS Definition corrected by Don Reble, Sep 04 2008 STATUS approved

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Last modified April 22 09:42 EDT 2024. Contains 371894 sequences. (Running on oeis4.)