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 A193294 Sum of even divisors of Fibonacci(n). 2
 0, 0, 2, 0, 0, 14, 0, 0, 36, 0, 0, 390, 0, 0, 744, 0, 0, 5040, 0, 0, 11816, 0, 0, 154752, 0, 0, 213840, 0, 0, 1999872, 0, 0, 3564360, 0, 0, 46656000, 0, 0, 63517896, 0, 0, 526048320, 0, 0, 1465647264, 0, 0, 16665772032, 0, 0, 20377766312, 0, 0, 173039328000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS Charles R Greathouse IV, Table of n, a(n) for n = 1..1000 EXAMPLE a(6) = 14 because Fibonacci(6) = 8, and the sum of the even divisors {2, 4, 8} = 14. MATHEMATICA Table[Total[Select[Divisors[Fibonacci[n]], EvenQ[ # ]&]], {n, 75}] PROG (PARI) a(n)=if(n%3, 0, 2*sigma(fibonacci(n)/2)) \\ Charles R Greathouse IV, Jul 31 2011 CROSSREFS Cf. A000045, A193291. Sequence in context: A244139 A231031 A061848 * A231049 A231080 A231246 Adjacent sequences:  A193291 A193292 A193293 * A193295 A193296 A193297 KEYWORD nonn AUTHOR Michel Lagneau, Jul 21 2011 STATUS approved

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Last modified February 25 06:46 EST 2020. Contains 332220 sequences. (Running on oeis4.)