oblong number

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Oblong numbers formed by doubling triangular numbers

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illustration of the walking titanosaurus, Patagotitan mayorum

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Cheetah (Acinonyx jubatus) standing on rock, side view, Masai Mara National Reserve, Kenya

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The tomb of Saint Nicholas in the crypt of the Basilica di San Nicola, Bari, Apulia, Italy

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Lusitania sinking, illustration from The War of the Nations (New York), December 31, 1919. World War I, WWI. This image is one of three on the page. (See source file for the other two.)

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Mona Lisa, oil on wood panel by Leonardo da Vinci, c. 1503-06; in the Louvre, Paris, France. 77 x 53 cm.

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oblong number

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definition and properties

In number game: Polygonal and other figurate numbers
Oblong numbers are the numbers of dots that can be placed in rows and columns in a rectangular array, each row containing one more dot than each column. The first few oblong numbers are 2, 6, 12, 20, and 30. This series of numbers is…
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