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A069110 Squarefree part of F(n) (the Fibonacci numbers): the smallest number such that a(n)*F(n) is a square. 2
1, 1, 2, 3, 5, 2, 13, 21, 34, 55, 89, 1, 233, 377, 610, 987, 1597, 646, 4181, 6765, 10946, 17711, 28657, 322, 3001, 121393, 196418, 317811, 514229, 208010, 1346269, 2178309, 3524578, 5702887, 9227465, 103683, 24157817, 39088169, 63245986 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..1408 (terms 1..200 from Vincenzo Librandi)

MATHEMATICA

Column[Table[Times@@Power@@@({#[[1]], Mod[#[[2]], 2]}&/@FactorInteger[Fibonacci[n]]), {n, 20}]] (* Vincenzo Librandi, Nov 13 2014 *)

PROG

(PARI) for(n=1, 60, print1(core(fibonacci(n)), ", "))

(MAGMA) [SquareFree(Fibonacci(n)): n in [1..20]]; // Vincenzo Librandi, Nov 13 2014

CROSSREFS

Cf. A007913.

Sequence in context: A060385 A080648 A113195 * A238684 A202694 A123221

Adjacent sequences:  A069107 A069108 A069109 * A069111 A069112 A069113

KEYWORD

easy,nonn

AUTHOR

Benoit Cloitre, Apr 06 2002

STATUS

approved

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Last modified May 15 12:37 EDT 2021. Contains 343920 sequences. (Running on oeis4.)