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Line 1: A '''hexagonal [[pyramidal number]]''' is a number formed by adding the first few [[hexagonal numbers]]. The first few numbers are: :1, 7, 22, 50, 95, 161, 252, 372, 525, 715, 946, 1222, 1547, 1925 {{OEIS\|id=A002412}}

Hexagonal pyramidal number: Difference between revisions