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A038672 Numbers n such that n is prime but n-th Fibonacci number is composite. 4
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, 307, 311, 313, 317, 331, 337 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Hans Havermann, Table of n, a(n) for n = 1..10000

Hans Havermann, Composite Prime-Index Fibonacci Numbers Factored

MATHEMATICA

Rest[Select[Prime[Range[68]], ! PrimeQ[Fibonacci[#]] &]] (* Jayanta Basu, Jul 10 2013 *)

s={A083668}; Complement[Prime[Range[2, 10034]], s] (* Hans Havermann, Feb 12 2014 *)

CROSSREFS

Cf. A090819 (essentially identical), A083668, A135952.

Sequence in context: A038542 A269262 A166659 * A250216 A125148 A214798

Adjacent sequences:  A038669 A038670 A038671 * A038673 A038674 A038675

KEYWORD

nonn

AUTHOR

Jeff Burch

STATUS

approved

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Last modified May 28 10:34 EDT 2017. Contains 287240 sequences.