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;;; data-tasks.el --- Primitive Operations on Lisp Data Types -*- lexical-binding: t; -*-
;; Copyright (C) 2018 Free Software Foundation, Inc.
;; Author: Gemini Lasswell <gazally@runbox.com>
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <https://www.gnu.org/licenses/>.
;;; Code:
(require 'erb-task)
(erb-deftask data-tasks-prime-p ()
"Verify that a large prime number is prime."
(:version "1.0")
(erb-task-time (data-tasks-prime-p 2305843009)))
(defun data-tasks-prime-p (n)
(or (= n 2)
(and (> n 2)
(= 1 (% n 2))
(catch 'not-prime
(dotimes (i (1+ (truncate (sqrt n))))
(when (and (> i 2) (zerop (% n i)))
(throw 'not-prime nil)))
t))))
(provide 'data-tasks)
;;; data-tasks.el ends here
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