{"id":175,"date":"2012-06-24T23:55:58","date_gmt":"2012-06-24T14:55:58","guid":{"rendered":"http:\/\/yucchi.jp\/blog\/?p=175"},"modified":"2013-04-24T22:15:54","modified_gmt":"2013-04-24T13:15:54","slug":"%e7%b4%a0%e6%95%b0%e3%82%92%e6%b1%82%e3%82%81%e3%82%8b","status":"publish","type":"post","link":"http:\/\/yucchi.jp\/blog\/?p=175","title":{"rendered":"\u7d20\u6570\u3092\u6c42\u3081\u308b"},"content":{"rendered":"<p><font size=\"3\">\u7d20\u6570\u3092\u6c42\u3081\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u8003\u3048\u3066\u307f\u305f\u3002<\/font><\/p>\n<p><font size=\"3\">\u307e\u305a\u7d20\u6570\u3068\u306f\u3069\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u304b\u78ba\u8a8d\u3057\u305f\u3002<\/font><\/p>\n<p><font size=\"3\">1<\/font><font size=\"3\"> \u3068\u81ea\u5206\u81ea\u8eab\u4ee5\u5916\u306b<\/font><font size=\"3\">\u6b63\u306e\u7d04\u6570<\/font><font size=\"3\">\u3092\u6301\u305f\u306a\u3044\u30011 \u3067\u306a\u3044<\/font><font size=\"3\">\u81ea\u7136\u6570<\/font><font size=\"3\">\u306e\u3053\u3068\u3067\u3042\u308b\u3002<\/font><\/p>\n<p><font size=\"3\">\u3068\u3044\u3046\u3053\u3068\u306f\u30011 \u3088\u308a\u5927\u304d\u304f\u3066\u81ea\u5206\u81ea\u8eab\u3067\u306a\u3044\u3068\u5272\u308a\u5207\u308c\u306a\u3044\u81ea\u7136\u6570\u3067\u3042\u308b\u3063\u3066\u3053\u3068\u304b\u306a\u3002<\/font><\/p>\n<p><font size=\"3\">\u5b8c\u5168\u306b\u7dcf\u5f53\u305f\u308a\u65b9\u5f0f\u3067\u3044\u3051\u3070\u697d\u52dd\u3067\u3059\u306d\u3002<\/font><\/p>\n<p><font size=\"3\">\u3067\u3082\u30012 \u3088\u308a\u5927\u304d\u306a\u5076\u6570\u306f 2 \u3067\u5272\u308a\u5207\u308c\u308b\u304b\u3089\u9664\u5916\u3059\u308c\u3070\u3044\u3044\u3057\u3001<\/font><\/p>\n<p><font size=\"3\">\u30bf\u30fc\u30b2\u30c3\u30c8 n \u304c\u5408\u6210\u6570\uff08\u7d20\u6570\u3067\u306a\u3044\u6570\uff09\u306e\u5834\u5408\u3001n=ab \u3068\u306a\u308b\u81ea\u7136\u6570 a , b \u304c\u5b58\u5728\u3059\u308b\u3002<\/font><\/p>\n<p><font size=\"3\">a \u3068 b \u3092\u639b\u3051\u308b\u3068\u3001n \u306b\u306a\u308b\u306e\u3060\u304b\u3089\u3001a , b \u306e\u3046\u3061\u3069\u3061\u3089\u304b\u306f n \u306e\u5e73\u65b9\u6839\u4ee5\u4e0b\u3067\u3042\u308a\u3001\u3069\u3061\u3089\u304b\u306f n \u306e\u5e73\u65b9\u6839\u4ee5\u4e0a\u3060\u3002<\/font><\/p>\n<p><font size=\"3\">\u5f93\u3063\u3066\u3001\u7d20\u6570\u3067\u306a\u3044\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3059\u308b\u306b\u306f\u3001n\u306e\u5e73\u65b9\u6839\u4ee5\u4e0b\u306e\u81ea\u7136\u6570\u3067\u5272\u308a\u5207\u308c\u308b\u304b\u3069\u3046\u304b\u8abf\u3079\u308c\u3070\u3044\u3044\u306f\u305a\u3002<\/font><\/p>\n<p><font size=\"3\">\u3053\u308c\u3089\u306e\u7279\u5fb4\u3092\u3075\u307e\u3048\u305f\u4e0a\u3067\u3001 3 \u5104\u307e\u3067\u306e\u7d20\u6570\u3092\u6c42\u3081\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u304f\u3093\u3067\u307f\u305f\u3002<\/font><\/p>\n<style type=\"text\/css\">\n<!--\ntable {color: #000000; background-color: #e9e8e2; font-family: \u3086\u305f\u307d\u3093\uff08\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\uff09}\n-->\n<\/style>\n<table width=\"100%\">\n<tbody>\n<tr>\n<td align=\"left\">jp\\yucchi\\primenumber_loop\\PrimeNumber_Loop.java<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre>\r\npackage jp.yucchi.primenumber_loop;\r\n\r\npublic class PrimeNumber_Loop {\r\n\r\n    private static final long TARGET_NUMBER = 300_000_000L;\r\n\r\n    public static void main(String[] args) {\r\n        long startTime = System.nanoTime();\r\n        long n, i, primeCounter = 0L;\r\n        for (n = 2L; n <= TARGET_NUMBER; n++) {\r\n            \/\/ 2 \u3088\u308a\u5927\u304d\u306a\u5076\u6570\u306f\u51e6\u7406\u3092\u30b9\u30ad\u30c3\u30d7           \r\n            if ((n &#038; 0b1) == 0 &#038;&#038; n > 2) {\r\n                continue;\r\n            }\r\n            for (i = (long) Math.sqrt(n); n % i != 0; i--) {\r\n                \/\/ n \u3092\u5272\u308a\u5207\u308b i \u3092\u898b\u3064\u3051\u51fa\u3059\u51e6\u7406\r\n            }\r\n            if (i == 1) { \/\/ n \u3092\u5272\u308a\u5207\u308c\u305a i \u304c 1 \u306e\u5834\u5408\u306f\u7d20\u6570\u3068\u5224\u5b9a\r\n                primeCounter++;\r\n                System.out.println(n + \" is Prime Number.\" + \" ---> \" + primeCounter);\r\n            }\r\n        }\r\n        System.out.println(primeCounter + \"\u500b\u306e\u7d20\u6570\u3092\u691c\u51fa\u3057\u307e\u3057\u305f\u3002\");\r\n        long time = System.nanoTime() - startTime;\r\n        System.out.println((int) (time * 1e-9) \/ 3_600 + \"\u6642\u9593\"\r\n                + (int) ((time * 1e-9) \/ 60) % 60 + \"\u5206\"\r\n                + (int) (time * 1e-9 % 60) + \"\u79d2\"\r\n                + Double.toString((time * 1e-9 % 60) % 1).substring(2));\r\n    }\r\n}\r\n\r\n<\/pre>\n<p><font size=\"3\">\u3053\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5b9f\u884c\u7d50\u679c\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u3063\u305f\u3002<\/font><\/p>\n<p><font size=\"3\"><\/font><br \/><font size=\"3\">2 is Prime Number. &#8212;&gt; 1<br \/>3 is Prime Number. &#8212;&gt; 2<br \/>5 is Prime Number. &#8212;&gt; 3<br \/>7 is Prime Number. &#8212;&gt; 4<br \/>11 is Prime Number. &#8212;&gt; 5<br \/>13 is Prime Number. &#8212;&gt; 6<br \/>17 is Prime Number. &#8212;&gt; 7<br \/>19 is Prime Number. &#8212;&gt; 8<br \/>23 is Prime Number. &#8212;&gt; 9<br \/>29 is Prime Number. &#8212;&gt; 10<\/font><\/p>\n<p><font size=\"3\">299999771 is Prime Number. &#8212;&gt; 16252316<br \/>299999801 is Prime Number. &#8212;&gt; 16252317<br \/>299999807 is Prime Number. &#8212;&gt; 16252318<br \/>299999813 is Prime Number. &#8212;&gt; 16252319<br \/>299999827 is Prime Number. &#8212;&gt; 16252320<br \/>299999897 is Prime Number. &#8212;&gt; 16252321<br \/>299999923 is Prime Number. &#8212;&gt; 16252322<br \/>299999939 is Prime Number. &#8212;&gt; 16252323<br \/>299999957 is Prime Number. &#8212;&gt; 16252324<br \/>299999977 is Prime Number. &#8212;&gt; 16252325<br \/>16252325\u500b\u306e\u7d20\u6570\u3092\u691c\u51fa\u3057\u307e\u3057\u305f\u3002<br \/>4\u6642\u959329\u520624\u79d210574628300128097<\/font><\/p>\n<p><font size=\"3\"><\/font>&nbsp;<\/p>\n<p><font size=\"3\">\u51c4\u304f\u6642\u9593\u304c\u304b\u304b\u3063\u305f\uff08\u00d7_\u00d7\uff09<\/font><\/p>\n<p><font size=\"3\">\u3061\u306a\u307f\u306b Dual Xeon 3GHz \u3067\u7dcf\u30b3\u30a2\u6570 8 \u3067\u3059\u3002<\/font><\/p>\n<p><font size=\"3\">\u30cf\u30a4\u30d1\u30fc\u30b9\u30ec\u30c3\u30c9\u306f\u7121\u3044\u53e4\u3044 CPU \u3067\u3059\u3002<\/font><\/p>\n<p><font size=\"3\">\u3061\u3087\u3063\u3068\u3067\u3082\u6642\u9593\u77ed\u7e2e\u3059\u308b\u70ba\u306b\u6b21\u56de\u306f\u4e26\u5217\u51e6\u7406\u3092\u3055\u305b\u3066\u307f\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/font><\/p>\n<p><font size=\"3\">\u5b9f\u306f\u4e26\u5217\u51e6\u7406\u306e\u65b9\u6cd5\u306f java.util.concurrent \u30d1\u30c3\u30b1\u30fc\u30b8\u306b\u3064\u3044\u3066\u8abf\u3079\u3066\u3044\u305f\u6642\u306b\u3042\u308b\u30b5\u30a4\u30c8\u306b<\/font><\/p>\n<p><font size=\"3\">\u30b5\u30f3\u30d7\u30eb\u30d7\u30ed\u30b0\u30e9\u30e0\u3068\u3057\u3066\u3042\u308a\u307e\u3057\u305f\u3002<\/font><\/p>\n<p><font size=\"3\">\u305d\u308c\u3092\u3061\u3087\u3063\u3068\u3060\u3051\u5909\u66f4\u3057\u3066\u4f7f\u7528\u3055\u305b\u3066\u3044\u305f\u3060\u304d\u307e\u3059\u3002<\/font><\/p>\n<p><font size=\"3\">\u3068\u8a00\u3044\u3064\u3064\u7761\u9b54\u306b\u8972\u308f\u308c\u3066\u304d\u305f\u306e\u3067\u307e\u305f\u4eca\u5ea6\u3063\u3066\u3053\u3068\u306b\u3057\u307e\u3059\u3002<\/font><\/p>\n<p><font size=\"3\">\u305d\u308c\u3067\u306f\u3001\u3064\u3065\u304d\u306f <strike>Web \u3067\uff01<\/strike><\/font><\/p>\n<p><font size=\"3\">\u304a\u3084\u3059\u307f\uff5e\uff5e\uff5e\uff5e( ^.^)( -.-)( _ _)<\/font><\/p>\n<div style=\"padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; display: inline; float: none; padding-top: 0px\" id=\"scid:0767317B-992E-4b12-91E0-4F059A8CECA8:73d4e648-ff85-4fc9-8a3d-a62590d483cc\" class=\"wlWriterEditableSmartContent\">Hatena \u30bf\u30b0: <a href=\"http:\/\/b.hatena.ne.jp\/t\/Java\" rel=\"tag\">Java<\/a><\/div>\n<p><font size=\"3\"><\/font><\/p>\n<div class='wp_social_bookmarking_light'>\n            <div class=\"wsbl_hatena\"><a href='\/\/b.hatena.ne.jp\/add?mode=confirm&url=http%3A%2F%2Fyucchi.jp%2Fblog%2F%3Fp%3D175&title=%E7%B4%A0%E6%95%B0%E3%82%92%E6%B1%82%E3%82%81%E3%82%8B' title='\u3053\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u306f\u3066\u306a\u30d6\u30c3\u30af\u30de\u30fc\u30af\u306b\u8ffd\u52a0' rel=nofollow class='wp_social_bookmarking_light_a' target=_blank><img src='http:\/\/yucchi.jp\/blog\/wp-content\/plugins\/wp-social-bookmarking-light\/public\/images\/hatena.gif' 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annotation=\"none\" href=\"http:\/\/yucchi.jp\/blog\/?p=175\" ><\/g:plusone><\/div>\n            <div class=\"wsbl_twitter\"><a href=\"https:\/\/twitter.com\/share\" class=\"twitter-share-button\" data-url=\"http:\/\/yucchi.jp\/blog\/?p=175\" data-text=\"\u7d20\u6570\u3092\u6c42\u3081\u308b\" data-lang=\"ja\">Tweet<\/a><\/div>\n    <\/div>\n<br class='wp_social_bookmarking_light_clear' \/>\n","protected":false},"excerpt":{"rendered":"<p>\u7d20\u6570\u3092\u6c42\u3081\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u8003\u3048\u3066\u307f\u305f\u3002 \u307e\u305a\u7d20\u6570\u3068\u306f\u3069\u306e\u3088\u3046\u306b\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u304b\u78ba\u8a8d\u3057\u305f\u3002 1 \u3068\u81ea\u5206\u81ea\u8eab\u4ee5\u5916\u306b\u6b63\u306e\u7d04\u6570\u3092\u6301\u305f\u306a\u3044\u30011 \u3067\u306a\u3044\u81ea\u7136\u6570\u306e\u3053\u3068\u3067\u3042\u308b\u3002 \u3068\u3044\u3046\u3053\u3068\u306f\u30011 \u3088\u308a\u5927\u304d\u304f\u3066\u81ea\u5206\u81ea\u8eab\u3067\u306a\u3044\u3068\u5272\u308a\u5207\u308c\u306a\u3044\u81ea\u7136\u6570\u3067\u3042\u308b\u3063\u3066\u3053\u3068\u304b\u306a\u3002 \u5b8c\u5168\u306b\u7dcf\u5f53\u305f\u308a\u65b9\u5f0f\u3067\u3044\u3051\u3070\u697d\u52dd\u3067\u3059\u306d\u3002 \u3067\u3082\u30012 \u3088\u308a\u5927\u304d\u306a\u5076\u6570\u306f 2 \u3067\u5272\u308a\u5207\u308c\u308b\u304b\u3089\u9664\u5916\u3059\u308c\u3070\u3044\u3044\u3057\u3001 \u30bf\u30fc\u30b2\u30c3\u30c8 n \u304c\u5408\u6210\u6570\uff08\u7d20\u6570\u3067\u306a\u3044\u6570\uff09\u306e\u5834\u5408\u3001n=ab \u3068\u306a\u308b\u81ea\u7136\u6570 a , b \u304c\u5b58\u5728\u3059\u308b\u3002 a \u3068 b \u3092\u639b\u3051\u308b\u3068\u3001n \u306b\u306a\u308b\u306e\u3060\u304b\u3089\u3001a , b \u306e\u3046\u3061\u3069\u3061\u3089\u304b\u306f n \u306e\u5e73\u65b9\u6839\u4ee5\u4e0b\u3067\u3042\u308a\u3001\u3069\u3061\u3089\u304b\u306f n \u306e\u5e73\u65b9\u6839\u4ee5\u4e0a\u3060\u3002 \u5f93\u3063\u3066\u3001\u7d20\u6570\u3067\u306a\u2026<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[17],"class_list":["post-175","post","type-post","status-publish","format-standard","hentry","category-java","tag-java"],"_links":{"self":[{"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/175","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=175"}],"version-history":[{"count":3,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/175\/revisions"}],"predecessor-version":[{"id":834,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/175\/revisions\/834"}],"wp:attachment":[{"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=175"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=175"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=175"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}