From Wikipedia, the free encyclopedia
Numerus pyramidalis[1] [2] (Germanice) accipitur si primi numeri quadrati summantur ut summa sit numerus pyramidalis quadratus numero . Hac in imagine numerus sphaerarum aequalis est quarto numero pyramidali quadrato:
In quarta columna a laeva sunt numeri pyramidales trigonales.
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| 1 | 1 | |||||||
| 1 | 2 | 1 | ||||||
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| 1 | 4 | 6 | 4 | 1 | ||||
| 1 | 5 | 10 | 10 | 5 | 1 | |||
| 1 | 6 | 15 | 20 | 15 | 6 | 1 | ||
| 1 | 7 | 21 | 35 | 35 | 21 | 7 | 1 | |
| 1 | 8 | 28 | 56 | 70 | 56 | 28 | 8 | 1 |
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