OFFSET
1,6
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..1000
FORMULA
EXAMPLE
a(6) = 3 because Fibonacci(6) = 8 and the 3 even divisors are {2, 4, 8}.
MATHEMATICA
a[n_] := Block[{d = Divisors[Fibonacci[n]]}, Count[EvenQ[d], True]]; Table[a[n], {n, 110}]
PROG
(PARI) a(n)=if(n%3, 0, numdiv(fibonacci(n)/2)) \\ Charles R Greathouse IV, Jul 30 2011
CROSSREFS
KEYWORD
nonn
AUTHOR
Michel Lagneau, Jul 21 2011
STATUS
approved