nah, all the important numbers are pretty much the ones listed here:
http://pauillac.inria.fr/algo/bsolve/constant/constant.htmlVery cool stuff.

The main ones I frequently encounter and use out of that list are probably 0, 1, i,
p, e, euler's constant (
g), khinchin's constant (K), gamma-related constants (m
0,
G(¼), etc.), stieltjes constants (
g1,
g2, etc.), EI-related constants (soldner, EI(1), etc.) and zeta-related constants (glaisher, z
0, etc.). I suppose 69, 402 or 412 might occur somewhere in the long trains of numbers there (most are irrational, if not transcendental), but then again, do they have some special significance or something?
