{"id":19326,"date":"2023-01-01T06:50:00","date_gmt":"2022-12-31T21:50:00","guid":{"rendered":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/?p=19326"},"modified":"2023-01-01T06:50:00","modified_gmt":"2022-12-31T21:50:00","slug":"2023%e3%81%af%e7%b4%a0%e6%95%b0%e3%81%a7%e3%81%af%e3%81%aa%e3%81%84","status":"publish","type":"post","link":"https:\/\/je1sgh.mydns.jp\/je1sghblog\/?p=19326","title":{"rendered":"2023\u306f\u7d20\u6570\u3067\u306f\u306a\u3044"},"content":{"rendered":"\n

一見すると素数かと思う2023ですが，なんと，17x17x7だそうです．17と7の倍数ってだけで十分な感じもします😓<\/p>\n\n\n\n

さかのぼると2021はなんと43×47で素数ではなく2019は3の倍数なので，直近の素数の年は2017年です．<\/p>\n\n\n\n

また，次の素数は2027年まで待たないといけないです．そして2029年と続きますが，その先はなんと2039年だそうで，それまで生きていたいものです．<\/p>\n\n\n\n

ということで今年は素数でないので少し残念ですが，明けましておめでとうございます．<\/strong>今年もよろしくお願いいたします．<\/p>\n\n\n\n

ちなみに昔のヨーロッパでは日が沈むと日が変わり，江戸時代までの日本では日が出ると日が変わるというのを “チコちゃんに叱られる<\/a>” などで知りました．<\/p>\n\n\n\n

したがって，12月24日のクリスマスイブは，12月25日の夕方（ “evening” ）だったわけで，「イブ」には前日という意味はありません．<\/p>\n\n\n\n

また，日が出ると日が変わる日本では，1月1日の日の出はまさに新年が始まる瞬間だったわけです．そんなことも知らずに初日の出を見て浮かれている日本国民のなんと多いことか．<\/p>\n\n\n\n

浮かれついでに子供のころ親に「初夢は1月1日の夜1<\/a><\/sup>より科学的には1月2日の未明．<\/span>に見る夢だ」と言われたもんですが，その理由も知らずによく偉そうに言ったもんです．1月1日の日が出て日付（年も）が変わるんですからそれより前に見た夢は前年最後の夢だと簡単に分かる話です．<\/p>\n\n\n\n

もうひとつついで言うと新年のカウントダウン直後に神社仏閣に詣でても初詣にはならないことも自明です．神社仏閣はさい銭がもらえるので文句は言わないでしょうけど．<\/p>\n\n\n\n

（この記事は，当地の日の出の時刻6:50に公開されるようにセットしました．）<\/p>\n","protected":false},"excerpt":{"rendered":"

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\u3068\u3044\u3046\u3053\u3068\u3067\u4eca\u5e74\u306f\u7d20\u6570\u3067\u306a\u3044\u306e\u3067\u5c11\u3057\u6b8b\u5ff5\u3067\u3059\u304c\uff0c\u660e\u3051\u307e\u3057\u3066\u304a\u3081\u3067\u3068\u3046\u3054\u3056\u3044\u307e\u3059\uff0e\u4eca\u5e74\u3082\u3088\u308d\u3057\u304f\u304a\u9858\u3044\u3044\u305f\u3057\u307e\u3059\uff0e \u3061\u306a\u307f\u306b\u6614\u306e\u30e8\u30fc\u30ed\u30c3\u30d1\u3067\u306f\u65e5\u304c\u6c88\u3080\u3068\u65e5\u304c\u5909\u308f\u308a\uff0c\u6c5f\u6238\u6642\u4ee3\u307e\u3067\u306e\u65e5\u672c\u3067\u306f\u65e5\u304c\u51fa\u308b\u3068\u65e5\u304c\u5909\u308f\u308b\u3068\u3044\u3046\u306e\u3092 “\u30c1\u30b3\u3061\u3083\u3093\u306b\u53f1\u3089\u308c\u308b” \u306a\u3069\u3067\u77e5\u308a\u307e\u3057\u305f\uff0e \u3057\u305f\u304c\u3063\u3066\uff0c12\u670824\u65e5\u306e\u30af\u30ea\u30b9\u30de\u30b9\u30a4\u30d6\u306f\uff0c12\u670825\u65e5\u306e\u5915\u65b9\uff08 “evening” 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