3rdheptagonalnumber

<-- Enter heptagonal number statement
  

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Calculate heptagonal number 3

The formula for heptagonal number n is as follows

Hn  =	n(5n - 3)
	2

Given n = 3, we have:

H3  =	3(5(3) - 3)
	2

H3  =	3(15 - 3)
	2

H3  =	3(12)
	2

H3  =	36
	2

H₃ = 18

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