A103736 Fibonacci numbers with nonprime indices.

0, 1, 3, 8, 21, 34, 55, 144, 377, 610, 987, 2584, 6765, 10946, 17711, 46368, 75025, 121393, 196418, 317811, 832040, 2178309, 3524578, 5702887, 9227465, 14930352, 39088169, 63245986, 102334155, 267914296, 701408733, 1134903170, 1836311903

Offset

0,3

Links

Table of n, a(n) for n=0..32.

Example

55 is included because 55 is the 10th Fibonacci number and 10 is composite.

Maple

with(combinat): a:=proc(n) if isprime(n)=false then fibonacci(n) else fi end: seq(a(n), n=0..52); # Emeric Deutsch, Oct 04 2005

Mathematica

Fibonacci /@ Select[Range[0, 46], ! PrimeQ[ # ] &] (* Robert G. Wilson v *)
Module[{nn=50, ix}, ix=Table[If[PrimeQ[n], 0, 1], {n, 0, nn}]; Pick[Fibonacci[ Range[ 0, nn]], ix, 1]] (* Harvey P. Dale, Apr 26 2018 *)

Crossrefs

Cf. A000045, A018252, A090206.

Sequence in context: A046815 A203848 A160404 * A172243 A101332 A007773

Adjacent sequences: A103733 A103734 A103735 * A103737 A103738 A103739

Keyword

nonn

Author

Leroy Quet, Oct 01 2005

Extensions

More terms from Robert G. Wilson v and Emeric Deutsch, Oct 04 2005

Status

approved