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Hexagonal pyramidal number

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Title: Hexagonal pyramidal number  
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Subject: 161 (number), Pyramidal number, List of recreational number theory topics, Figurate numbers, 252 (number)
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Hexagonal pyramidal number

A hexagonal pyramidal number is a pyramidal number formed by adding the first few hexagonal numbers. The first few of these numbers are:

1, 7, 22, 50, 95, 161, 252, 372, 525, 715, 946, 1222, 1547, 1925 (sequence A002412 in OEIS).

The nth number in this sequence is given by the formula



  • Hexagonal pyramidal number at MathWorld

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