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7thoctagonalnumber
<-- Enter octagonal number statement
Calculate octagonal number 7
The formula for octagonal number n is as follows
O
n
= n(3n - 2)
Given n = 7, we have:
O
n
= 7(3(7) - 2)
O
n
= 7(21 - 2)
O
n
= 7(19)
O
7
=
133
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