> On Jan 19, 2004, at 12:39 PM, Laura wrote: > > > Im really stuck on this sequence of numbers; 5, 20, 50, 100, 175, 280, > > and how to find the formula for the nth term. Please can anybody > > enlighten me?!
If your sequence consists of successive values of an nth degree polynomial, then its nth differences will be constant. This happens for the third differences in this example: