5thheptagonalnumber

<-- Enter heptagonal number statement
  

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Calculate heptagonal number 5

The formula for heptagonal number n is as follows

Hn  =	n(5n - 3)
	2

Given n = 5, we have:

H5  =	5(5(5) - 3)
	2

H5  =	5(25 - 3)
	2

H5  =	5(22)
	2

H5  =	110
	2

H₅ = 55

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