2pi..........full circle on the unit circle...........the 1st 3 numbers of which............6.28.....contains the 1st 2 perfect numbers...............like the critical line.....at 1/2...............and one number above the dec and 2 #'s below it..............6 is above the dec point......28 is below it....................like 1/2....

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