# prevpow

prevpow(a, x)

The largest `a^n` not greater than `x`, where `n` is a non-negative integer. `a` must be greater than 1, and `x` must not be less than 1.

## Examples

1. Find the largest power of a not greater than x:

``````julia> prevpow(2, 10)
8``````

This example calculates the largest power of 2 that is not greater than 10.

2. Calculate the previous power of a larger number:

``````julia> prevpow(3, 20)
9``````

It returns the largest power of 3 that is not greater than 20.

3. Handle edge cases when x is equal to a^n:
``````julia> prevpow(4, 64)
64``````

It correctly handles the case where x is equal to a^n.

Common mistake example:

``````julia> prevpow(1, 5)
ERROR: ArgumentError: `a` must be greater than 1``````

In this example, the value of a is less than 1, which is not allowed. Make sure to provide a value of a that is greater than 1 to avoid such errors.

## User Contributed Notes

### Add a Note

The format of note supported is markdown, use triple backtick to start and end a code block.

*Required Field
Details

Checking you are not a robot: