どうも、KSTです。
本日、2012年7月1日は、普段より一秒長い日ですね。
理由はご存知のことと思いますが… 
まぁ、長いといっても一秒ですし、生活上で何かしら特別なことがあるわけではないので、あまりその実感がわかないのも事実です。
しかも、今日は日曜日。明日は月曜日と思うと、なんとなく憂鬱になる自分。
…で、気分をリフレッシュするために、瞬殺数学問題を一題出題してみることにします。
・・・・・・・・・・・・
【問題】
7999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
999999999999
は素数でしょうか？
なるべく簡単な方法で判別してください。
・・・・・・・・・・・・
大きな数の素数判定は、難しいことが多いですが、こちらは、分かる方には、本当に瞬殺の問題です。
使用する内容は高校までで習う範囲です。中学までの範囲でも出来ます。
本日、2012年7月1日は、普段より一秒長い日ですね。
理由はご存知のことと思いますが…
まぁ、長いといっても一秒ですし、生活上で何かしら特別なことがあるわけではないので、あまりその実感がわかないのも事実です。
しかも、今日は日曜日。明日は月曜日と思うと、なんとなく憂鬱になる自分。
…で、気分をリフレッシュするために、瞬殺数学問題を一題出題してみることにします。
・・・・・・・・・・・・
【問題】
7999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999999999999999
999999999999
は素数でしょうか？
なるべく簡単な方法で判別してください。
・・・・・・・・・・・・
大きな数の素数判定は、難しいことが多いですが、こちらは、分かる方には、本当に瞬殺の問題です。
使用する内容は高校までで習う範囲です。中学までの範囲でも出来ます。