中央の数字は
n
3Σk(k+1) = n(n+1)(n+2) のnを表わしてます
k=1
本年もよろしくお願いいたします
折角なのでテキストでも表してみますと
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〇 〇 〇 〇 11 〇 〇 〇 〇 〇&〇 〇 〇 〇 9 〇 〇 〇 〇
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〇
繰り返しになりますが中央の数字は
n
3Σk(k+1) = n(n+1)(n+2) のnを表わしてます
k=1
ところでΣを使わず表現するならば(あめやんでる的ですが)
●と〇が混ざった丸がたくさんあったので数えるために
以下のように並べてみましたってことで
●
● ●
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● 1-6-6:一巡目は6個で累積6個
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● 2-18-24:二巡目は18個で一巡目からの累積は24個(以下同様)
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● 3-36-60
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● 4-60-120
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● 5-90-210
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● 6-126-336
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● 7-168-504
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● 8-216-720
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● 9-270-990
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〇 10-330-1320
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〇 11-396-1716
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〇 〇
〇 12-306-2022;12巡目は306個を並べた段階なので累積は2022個
●と〇をあわせて2022個、●は1232個ってことで
2023.1.1
を表わしてるつもりで、txetotextの木の実の数え方1232との連動企画で~す。
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