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Numbers h such that h and h+1 have same antiharmonic mean of the numbers k < h such that gcd(k, h) = 1 and simultaneously this mean is not integer.
18

%I #6 Aug 02 2019 21:33:47

%S 6,65,69,77,129,185,194,210,221,237,254,309,321,330,365,398,417,437,

%T 462,473,482,497,533,546,554,570,573,581,597,614,626,662,669,681,690,

%U 713,753

%N Numbers h such that h and h+1 have same antiharmonic mean of the numbers k < h such that gcd(k, h) = 1 and simultaneously this mean is not integer.

%C Subsequence of A179875 and A179883.

%C For corresponding values of numbers h+1 see A179880. - _Jaroslav Krizek_, Jul 31 2010

%F a(n) = A179880(n) - 1. - _Jaroslav Krizek_, Jul 31 2010

%Y Cf. A179871, A179872, A179873, A179874, A179875, A179876, A179877, A179878, A179880, A179882, A179883, A179884, A179885, A179886, A179887, A179890, A179891.

%K nonn

%O 1,1

%A _Jaroslav Krizek_, Jul 30 2010