# Hexagonal pyramidal number

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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 the OEIS).

The nth number in this sequence is given by the formula

${\displaystyle {\frac {n(n+1)(4n-1)}{6}}.}$