Why does `toString(32)` wrong?

Question about the task

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Java Collections, Level 6, Lesson 15

Under discussion

Why does `toString(32)` wrong? 26 base-32 digits (32^26) exactly equals 2^130

new BigInteger(130, new SecureRandom()).toString(32);

And the answer says "Re-read the task conditions and use your favorite search engine. You should end up with something like:"

new BigInteger(130, new SecureRandom()).ToString (36)

Ref: https://stackoverflow.com/questions/29183818/why-use-tostring32-and-not-tostring36

We'll need several helper classes:
4.1. Create a Helper class.
4.1.1. Add a static String generateRandomString() method, which will generate a random string. Use the SecureRandom and BigInteger classes to do this. Hint: search for "random string Java" on Google.
The string may consist of numbers and any of the 26 letters of the lowercase English alphabet.
4.1.2. Add a static printMessage(String message) method to the class. It should display the passed text on the console. All subsequent output in the program should come through this method!
4.2. Create an ExceptionHandler class.
4.2.1. Add a static log(Exception e) method, which will display a brief description of the exception.

Requirements:

The Helper class's generateRandomString method should generate a random string in the manner described in the task conditions.
The Helper class's printMessage method should display the passed text on the screen.
The ExceptionHandler class's log method should display a brief description of the exception.

package com.codegym.task.task33.task3310; public class Solution { public static void main(String[] args) { } }

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