Given a number n, the task is to find the nth hexadecagonal number.
A Hexadecagonal number is class of figurate number and a perfect squares. It has sixteen sided polygon called hexadecagon or hexakaidecagon. The n-th hexadecagonal number count’s the sixteen number of dots and all others dots are surrounding to its successive layer.
Input : 2
Formula to calculate hexadecagonal number:
5th Hexadecagonal number : 145 9th Hexadecagonal number : 513
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