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pyramidal numbers
(redirected from Pyramidal number)

    Also found in: Wikipedia 0.01 sec.
pyramidal numbers [¦pir·ə‚mid·əl ′nəm·bərz]
(mathematics)
The numbers 1, 4, 10, 20, 35, …, which are the number of dots in successive pyramidal arrays and are given by (1/6)n(n+ 1) (n+ 2), wheren= 1, 2, 3, ….


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