{ "cells": [ { "cell_type": "code", "execution_count": 1, "metadata": { "collapsed": false }, "outputs": [ { "data": { "text/plain": [ ":pentagonal" ] }, "execution_count": 1, "metadata": {}, "output_type": "execute_result" } ], "source": [ "def pentagonal(n)\n", " n * (3 * n - 1) / 2\n", "end" ] }, { "cell_type": "code", "execution_count": null, "metadata": { "collapsed": true }, "outputs": [], "source": [] } ], "metadata": { "kernelspec": { "display_name": "Ruby 2.4.0", "language": "ruby", "name": "ruby" }, "language_info": { "file_extension": ".rb", "mimetype": "application/x-ruby", "name": "ruby", "version": "2.4.0" } }, "nbformat": 4, "nbformat_minor": 0 }