Welcome to the Friday mental_floss Brain Game, which is a quick one. Good luck!

What is the next number in this sequence, and why?

33, 34, 37, 39, 41, 42, ?

Here is the SOLUTION.

THE SOLUTION:

The next number in the series is 44.

The numbers represent the base first-class U.S. postage rate in cents, from 2000-now.

Since 2000, the rate has increased from 33 cents to 34, 37, 39, 41, 42,and then to 44 cents in May 2009.

An increase to 46 cents (scheduled for January 2, 2011) was rejected in September 2010 and is currently under appeal.