cp's OEIS Frontend

A117538 Locations of the increasing peak values of the integral of the absolute value of the Riemann zeta function between successive zeros on the critical line. This can also be defined in terms of the Z function; if t and s are successive zeros of a renormalized Z function, z(x) = Z(2 Pi x/log(2)), then take the integral between t and s of |z(x)|. For each successively higher value of this integral, the corresponding term of the integer sequence is r = (t+s)/2 rounded to the nearest integer.

%I A117538 #13 Jan 30 2016 16:07:59
%S A117538 2,5,7,12,19,31,41,53,72,130,171,224,270,764,954,1178,1395,1578,2684,
%T A117538 3395,7033,8269,8539,14348,16808,36269,58973
%N A117538 Locations of the increasing peak values of the integral of the absolute value of the Riemann zeta function between successive zeros on the critical line. This can also be defined in terms of the Z function; if t and s are successive zeros of a renormalized Z function, z(x) = Z(2 Pi x/log(2)), then take the integral between t and s of |z(x)|. For each successively higher value of this integral, the corresponding term of the integer sequence is r = (t+s)/2 rounded to the nearest integer.
%C A117538 The fractional parts of the numbers r = (t+s)/2 above are very unevenly distributed. For all of the values in the table, the integers are in fact the unique integers contained in the interval of zeros [t, s] of z(x). An interesting challenge to anyone wishing to do computations related to the zeta function would be to find the first counterexample, where in fact the peak value interval did not contain the corresponding integer. Perhaps even more than the peak values of the zeta function themselves, these integrals are extremely closely related to relatively good equal divisions of the octave in music theory.
%D A117538 Edwards, H. M., Riemann's Zeta-Function, Academic Press, 1974
%D A117538 Titchmarsh, E. C., The Theory of the Riemann Zeta-Function, second revised (Heath-Brown) edition, Oxford University Press, 1986
%D A117538 Paris, R. B. and Kaminski, D., Asymptotics and Mellin-Barnes Integrals, Cambridge University Press, 2001
%H A117538 Andrew Odlyzko, <a href="http://www.dtc.umn.edu/~odlyzko/zeta_tables/index.html">The first 100,000 zeros of the Riemann zeta function, accurate to within 3*10^(-9)</a>
%H A117538 Wikipedia, <a href="http://en.wikipedia.org/wiki/Z_function">Z function</a>
%H A117538 <a href="/index/Z#zeta_function">Index entries for zeta function</a>.
%Y A117538 Cf. A117536, A117537, A117539, A054540.
%K A117538 hard,more,nonn
%O A117538 0,1
%A A117538 _Gene Ward Smith_, Mar 27 2006
%E A117538 Extended by _T. D. Noe_, Apr 21 2010