Euler’s Number

The number e is a famous irrational number called Euler’s number after Leonhard Euler a Swiss Mathematician (1707 – 1783). Number e is considered to be one of the most important numbers in mathematics.

The first few digits are: 2.7182818284590452353602874713527… It has an infinite number of digits with no recurring pattern. It cannot be written as a simple fraction.

Number e is the limit of (1 + 1/n)n as n approaches infinity:

Number e is a mathematical constant that is the base of the natural logarithm: the unique number whose natural logarithm is equal to one. Find out more on

In this challenge we will use a Python script to calculate an approximation of e using three different approaches. The first approach as described above as already been implemented in the above Python trinket.

Calculating e using an iterative approach

Euler’s number, e, can also be calculated as the sum of the infinite series:


Complete your Python script to implement this infinite series using an iterative approach. (Method 2)

Calculating e using a continuous fraction (iterative approach)

A less common approach to calculate number e is to use a continued fraction based on the following sequence:
Continued Fraction:

Complete your Python script to implement this continued fraction. (Method 3)



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