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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
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 A352377 A202694
KEYWORD
easy,nonn
AUTHOR
Benoit Cloitre, Apr 06 2002
STATUS
approved