The 100th pentagonal number is 14950.
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There is no equation - the answer is explicit in the name.A pentagonal prism has pentagonal bases. A pentagon has 5 sides. It could not be simpler!
The Nth number is (3N - 1), so the 100th number is 299 .
Five.Five.Five.Five.
100th
35.The first few pentagonal numbers are:1-1, five, 12-number, 22-number, 35-number, 51-number, 70-number, 92-number, 117, 145, 176, 210, 247, 287, 330, 376, 425, 477, 532, 590, 651, 715, 782, 852, 925, 1001-numberSource: pentagonal-number