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A250743
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Numerator of the harmonic mean of the first n positive Fibonacci numbers.
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2
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1, 1, 6, 24, 150, 720, 1560, 87360, 1670760, 20420400, 1999157160, 13085392320, 3302971111440, 103154328557280, 1348374437570160, 67598505136850688, 114701988497522458032, 2307534121538392979232, 10183789060049355548733936
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OFFSET
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1,3
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LINKS
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Colin Barker, Table of n, a(n) for n = 1..120
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EXAMPLE
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a(4) = 24 because the first 4 positive Fibonacci numbers are [1,1,2,3], and 4/(1/1+1/1+1/2+1/3) = 24/17.
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PROG
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(PARI) s=vector(30); f=Vec(x/(1-x-x^2)+O(x^(#s+1))); n=d=0; for(k=1, #s, n++; d+=1/f[k]; s[k]=numerator(n/d)); s
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CROSSREFS
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Cf. A000045 (Fibonacci numbers), A250744 (denominators).
Sequence in context: A188330 A126267 A026947 * A265883 A330498 A165491
Adjacent sequences: A250740 A250741 A250742 * A250744 A250745 A250746
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KEYWORD
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nonn,frac
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AUTHOR
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Colin Barker, Nov 27 2014
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STATUS
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approved
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