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A179873
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Corresponding values of antiharmonic means B(h) to numbers h from A179871 (numbers h such that antiharmonic mean of the numbers k < h such that gcd(k, h) = 1 is integer).
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18
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1, 1, 3, 7, 7, 11, 15, 15, 19, 23, 27, 31, 31, 35, 37, 39, 39, 47, 55, 55, 57, 59, 61, 63, 67, 71, 71, 73, 75, 77, 79, 87, 89, 91, 95, 97, 99, 111, 111, 113, 115, 119, 119, 121, 125, 127, 131, 135, 137, 143
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OFFSET
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1,3
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COMMENTS
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Conjecture: a(n) = nondecreasing sequence of odd numbers.
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LINKS
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FORMULA
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EXAMPLE
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MATHEMATICA
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B[n_] := Plus @@ ((ks = Select[Range[n], GCD[n, #] == 1 &])^2)/Plus @@ ks; Select[B /@ Range[215], IntegerQ] (* Ivan Neretin, May 22 2015 *)
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CROSSREFS
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Cf. A179871, A179872, A179874, A179875, A179876, A179877, A179878, A179879, A179880, A179882, A179883, A179884, A179885, A179886, A179887, A179890, A179891.
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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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