figurate number

[fig-yer-it]

noun Mathematics.

a number having the property that the same number of equally spaced dots can be arranged in the shape of a regular geometrical figure.

Origin:
1605–15

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Figurate_number is always a great word to know.

So is proportional. Does it mean:

a formula for determining additional values or derivatives of a function from the relationship of its given values

two quantities having the same or a constant ratio or relation

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