pyramidal number
(mathematics) A number that represents the number of items in a pyramid having a given number of sides and layers
plural of domainer
Any of several frugivorous birds, of the genus Sphecotheres, from Australia.
The capital city of Mauritania.
5層のピラミッドを組むのに何個の球が必要かを調べるために、彼女はそのピラミッドに含まれる物体の数を計算した。
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