UlamSpiral

This gem can generate Ulam spiral and also shows result on console

Installation

Add this line to your application's Gemfile:

gem 'ulam_spiral'

And then execute:

$ bundle

Or install it yourself as:

$ gem install ulam_spiral

Usage

require "ulam_spiral"

ulam_spiral = UlamSpiral.new(first_number: 3, last_number: 13)
ulam_spiral.generate_spiral
ulam_spiral.show
#=>  7       5
#=>
#=>      3      13
#=>
#=>         11