June 3, 2021
カテゴリ： カテゴリ未分類
英会話教室に行ってきました。アメリカで大量発生した素数ゼミの話をしました。
The prime number cicada(素数ゼミ)
I studied the prime numbers (Sosu in Japanese) in mathematics when I was in junior high school.
A prime number can only be divided by itself and one, like 2, 3, 5, 7, 11……
Last week I watched the news about a huge outbreak of cicadas in northern part of America. They are cicadas that have a seventeen year life spam. Also the thirteen year life interval cicadas will explosively appear in the southern part of America . 13 and 17 are both prime numbers so they are called the prime number cicadas.
The prime number are good for avoiding the predator like birds for cicadas. If the predator has three year interval life spam and the cicada life spam has fifteen year, they would meet every fifteen years. (Least Common Multiple 15) But the thirteen year cicadas only meet predators once every 39 years (LCM 3×13). So the prime number cicadas have increased throughout history.
This is the first time in my life I heard this news and the reason why these cicadas exist . It’s interesting that the prime number connect with nature.
But the speech of the prime minister isn’t interesting.
The prime number cicada(素数ゼミ)
I studied the prime numbers (Sosu in Japanese) in mathematics when I was in junior high school.
A prime number can only be divided by itself and one, like 2, 3, 5, 7, 11……
Last week I watched the news about a huge outbreak of cicadas in northern part of America. They are cicadas that have a seventeen year life spam. Also the thirteen year life interval cicadas will explosively appear in the southern part of America . 13 and 17 are both prime numbers so they are called the prime number cicadas.
The prime number are good for avoiding the predator like birds for cicadas. If the predator has three year interval life spam and the cicada life spam has fifteen year, they would meet every fifteen years. (Least Common Multiple 15) But the thirteen year cicadas only meet predators once every 39 years (LCM 3×13). So the prime number cicadas have increased throughout history.
This is the first time in my life I heard this news and the reason why these cicadas exist . It’s interesting that the prime number connect with nature.
But the speech of the prime minister isn’t interesting.
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