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A193293
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Sum of odd divisors of Fibonacci(n).
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2
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1, 1, 1, 4, 6, 1, 14, 32, 18, 72, 90, 13, 234, 420, 372, 1536, 1598, 360, 4332, 12096, 5908, 18000, 28658, 2496, 93062, 122148, 106920, 473760, 514230, 142848, 1349244, 3391488, 1782180, 5708056, 11924808, 1555200, 24664200, 40504200, 31758948, 209212416
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OFFSET
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1,4
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LINKS
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FORMULA
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EXAMPLE
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a(9) = 18 because Fibonacci(9) = 34 = 2*17 and the sum of the odd divisors
{1, 17}= 18.
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MATHEMATICA
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Table[Total[Select[Divisors[Fibonacci[n]], OddQ[ # ]&]], {n, 75}]
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PROG
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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