numbers.el is a little wrapper around http://numbersapi.com/ that can be used to display maths information and trivia about numbers. Two main commands are provided: `numbers-math' - Shows/inserts a maths-related fact about a number. `numbers-trivia' - Shows/inserts some trivia about a number. In both cases calling the command will prompt for a number. If there appears to be a number in the current buffer, near the current point, that number will be used as the default. If `universal-argument' is invoked first the result will be inserted into the current buffer, otherwise it is displayed in the message area. On the other hand, if number is provided as the prefix argument it is looked up and the result is displayed. In addition, a couple of commands are provided for getting facts and trivia about a random number: `numbers-random-math' - Shows/inserts a maths-related fact about a random number. `numbers-random-trivia' - Shows/inserts some trivia about a random number.