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A090819
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Primes p such that the p-th Fibonacci number is nonprime.
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21
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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
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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Fibonacci(37) = 24157817 = 73*149*2221. [corrected by Bobby Jacobs, Sep 25 2017]
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MATHEMATICA
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Select[Prime[Range[62]], ! PrimeQ[Fibonacci[#]] &] (* Jayanta Basu, Jul 10 2013 *)
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PROG
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(PARI) f(n) = forprime(x=2, n, p=fibonacci(x); if(!isprime(p), print1(x", ")))
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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EXTENSIONS
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Definition corrected by Don Reble, Sep 04 2008
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STATUS
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approved
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