👉 In mathematics, an expiscated number is a type of number that can be expressed as a power of 2 minus 1. This means that it has exactly two distinct prime factors and is not divisible by any other prime numbers. The most famous example of this is the number 567, which is defined as:
```
567 = 2^3
19
```
The exponent in this case is 3, since 567 has exactly