Graphical Representations of Depleted Zeta Subseries
It is well-known that the harmonic series diverges; equivalently, equals infinity. Remarkably, modified forms of , denoted here by , can yield various converging values. For example, deleting all terms in the harmonic series whose denominator contains a 9 converges to approximately 23; this is known as the Kempner sum. More generally, represents a subseries of with terms deleted whose denominator's base representation contains the string of digits given by .
The initialization code is copied from code (based on ) by Thomas Schmelzer and Robert Baillie: http://library.wolfram.com/infocenter/MathSource/7166/#downloads. Reference
 T. Schmelzer and R. Baillie, American Mathematical Monthly 115(6), June/July 2008, pp. 525-540.