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+# Semiprimes Service
+
+## Introduction
+
+A **composite** is a number containing at least two prime factors. For example:
+
+```
+15 = 3 × 5
+9 = 3 × 3
+12 = 2 × 2 × 3
+```
+
+There are ten composites below thirty containing precisely two, not necessarily
+distinct, prime factors: `4, 6, 9, 10, 14, 15, 21, 22, 25, 26`. Let’s call such
+numbers *Semiprimes*.
+
+## Task
+
+- Write a module which provides a function to tell whether a given number, `N`,
+  is a semiprime. `N` will be less than 100,000
+- Please implement an API (RESTful or GraphQL) to factor a given number into two
+  prime numbers if it’s a semiprime, otherwise, return an error message.
+
+## Stretch Goals
+
+- Handle the invalid inputs.
+- Support batch requests: i.e. users could provide 100 numbers, and the API
+  return the answer for all.
+- Considering this module will be used by a long running service, could you
+  optimize it to give answers faster?
+
+## Usage
+
+To run the application you'll need to have `elixir` installed. Assuming `elixir`
+is already installed, consult the following steps to start the application:
+
+```shell
+$ cd server
+$ mix deps.get
+$ iex -S mix
+```
+
+Now open a web browser and visit `http://localhost:8080`!
+