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A tetrahedral number, or triangular pyramidal number, is a figurate number that represents a pyramid with a triangular base and three sides, called a tetrahedron. The nth tetrahedral number, Ten, is the sum of the first n triangular numbers, that is, The tetrahedral numbers are: 1, 4, 10, 20, 35, 56, 84, 120, 165, 220, ... (sequence in the OEIS)

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• A tetrahedral number, or triangular pyramidal number, is a figurate number that represents a pyramid with a triangular base and three sides, called a tetrahedron. The nth tetrahedral number, Ten, is the sum of the first n triangular numbers, that is, The tetrahedral numbers are: 1, 4, 10, 20, 35, 56, 84, 120, 165, 220, ... (sequence in the OEIS) (en)
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• 509120 (xsd:integer)
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• 6792 (xsd:nonNegativeInteger)
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• 1021495686 (xsd:integer)
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• September 2018 (en)
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• diagram does not prove the statement (en)
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• Tetrahedral Number (en)
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• TetrahedralNumber (en)
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• A tetrahedral number, or triangular pyramidal number, is a figurate number that represents a pyramid with a triangular base and three sides, called a tetrahedron. The nth tetrahedral number, Ten, is the sum of the first n triangular numbers, that is, The tetrahedral numbers are: 1, 4, 10, 20, 35, 56, 84, 120, 165, 220, ... (sequence in the OEIS) (en)
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• Tetrahedral number (en)
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