Take all this with a grain of salt..........I do NOT know........analysis....which Riemann used to find the zeroes.............I am just using the intermediate math I know...........I would rather be wrong at some points............and have people correct stuff later.......than not to say anything...........and have something worthwhile to contribute...................put all that into perspective......this is like brain storming out loud............don't throw the baby out with the bath water.............but I am surmising and conjecturing greatly...........

The position of the complex zeros can be seen slightly more easily by plotting the contours of zero real (red) and imaginary (blue) parts, as illustrated above. The zeros (indicated as black dots) occur where the curves intersect. The figures above highlight the zeros in the complex plane by plotting (where the zeros are dips) and (where the zeros are peaks). The above plot shows for between 0 and 60. As can be seen, the first few nontrivial zeros occur at the values given in the following table (Wagon 1991, pp. 361-362 and 367-368; Havil 2003, p. 196; Odlyzko), where the corresponding negative values are also roots. The integers closest to these values are 14, 21, 25, 30, 33, 38, 41, 43, 48, 50, ... (OEIS A002410). The numbers of nontrivial zeros less than 10, , , ... are 0, 29, 649, 10142, 138069, 1747146, ... (OEIS A072080; Odlyzko). Sloane 1 A058303 14.134725 2 21.022040 3 25.010858 4 30.424876 5 32.935062 6 37.586178