Sheesh! I hate when they do that... 37 cents..39 cents..41 cents. Why not 40 cents..45 cents.., etc? It makes it so much easier for everyone.
I believe the method to their madness is that using an odd number such as 39 or 41 results in more postage sales such as one and two cent stamps that everybody has to buy in order to use all their old stamps up.
Yep!