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3rdheptagonalnumber
<-- Enter heptagonal number statement
Calculate heptagonal number 3
The formula for heptagonal number n is as follows
H
n
=
n(5n - 3)
2
Given n = 3, we have:
H
3
=
3(5(3) - 3)
2
H
3
=
3(15 - 3)
2
H
3
=
3(12)
2
H
3
=
36
2
H
3
=
18
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