# What are these numbers called?

Say I have numbers that are all multiple of 2, I would say, well they are multiples of two. How are numbers $x$ called with respect to $a$ that are all formed like $x = a^b$?

I am assuming here that $b$ is a positive integer.

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They are called powers of $a$ (although this is most common when $b$ is a positive integer).

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Thanks, edited the question to make the point that b should be a positive integer clearer. –  kutschkem Dec 5 '12 at 13:32

Here are some more formal definitions:

http://en.wikipedia.org/wiki/Exponentiation

http://mathworld.wolfram.com/Power.html

Enjoy!

-A

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Needs a long-overdue $\bf \;\uparrow\;$ –  amWhy May 16 at 1:01