The numbers are generated by
Pn = (3n2 - n)/2 for n = 1, 2, 3, ...
A list of pentagonal numbers (first 46) is given on the link below.
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A pentagonal what? A pentagonal pyramid or pentagonal prism have different numbers of vertices.
No, the first 10 pentagonal numbers: 1, 5, 12, 22, 35, 51, 70, 92, 117, 145
100 is a square.
64 is not a pentanganol number. Pentaganol Numbers (1 - 100) :- 1, 5, 12, 22, 35, 51, 70 & 92. Nor is is a centered pentaganol number Centered Pentaganol Numbers (1-100) :- 1, 6, 16, 31, 51 & 76
This is very easy. Simply square the number: 100 squared (100 x 100) = 10,000. So, the sum of the first 100 odd numbers is 10,000.