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1stpentagonalnumber
<-- Enter pentagonal number statement
Calculate pentagonal number 1
The formula for pentagonal number n is as follows
P
n
=
n(3n - 1)
2
Given n = 1, we have:
P
1
=
1(3(1) - 1)
2
P
1
=
1(3 - 1)
2
P
1
=
1(2)
2
P
1
=
2
2
P
1
=
1
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