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No, the first 10 pentagonal numbers: 1, 5, 12, 22, 35, 51, 70, 92, 117, 145

Q: Is 25 a pentagonal number

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square

The 100th pentagonal number is 14950.

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!

Five.Five.Five.Five.

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

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The 100th pentagonal number is 14950.

first triple digit pentagonal pyramidal number is 126

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!

5

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Five.Five.Five.Five.

A pentagonal pyramid has exactly 6 faces.and a pentagonal prisim has 7

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

126.

pentagonal prism

2:3