Given a number n, the task is to find the nth heptadecagonal number .
A heptadecagonal number is class of figurate number. It has seventeen sided polygon called heptadecagon. The n-th heptadecagonal number count’s the seventeen number of dots and all others dots are surrounding with a common sharing corner and make a pattern.
Input : 5
Formula to calculate nth heptadecagonal number:
3th Heptadecagonal number : 48 8th Heptadecagonal number : 428
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