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A225904
Numerator of Sum_{k=1..n} 1/L(k) where L(n) is the n-th Lucas number (A000204).
2
1, 4, 19, 145, 1679, 5191, 153311, 7286005, 69689327, 2869226821, 572447760301, 6593608277800, 3438637721790797, 966842075996112436, 119933240206586434591, 264753799412041684949165, 945570749875765527295137611, 303554979754466691916744807193
OFFSET
1,2
EXAMPLE
1, 4/3, 19/12, 145/84, 1679/924, 5191/2772, ... = A225904/A225905.
MATHEMATICA
Numerator[Table[Sum[1/LucasL[k], {k, 1, n}], {n, 1, 30}]]
Numerator[Accumulate[1/LucasL[Range[20]]]] (* Harvey P. Dale, Sep 16 2016 *)
CROSSREFS
KEYWORD
nonn,frac,easy
AUTHOR
Michel Lagneau, May 20 2013
STATUS
approved