Some Properties of the Multi-Figurate Numbers That Are Simultaneously Triangular and Centered Triangular
Francisco Hedyleno Coelho Bezerra, Francisco Regis Vieira Alves, Eudes Antonio Costa
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Source: Crossref
Published: Oct 27, 2026
DOI: 10.33434/cams.2016687
Open original source ↗Source abstract
A study of the multi-figurate numbers that are simultaneously triangular and centered triangular is presented. Starting from the generalized Pell equation associated with this class of multi-figurate numbers, we describe the corresponding sequence and investigate its algebraic properties. In particular, we obtain a companion matrix representation for the sequence. In addition, we derive several identities of Tagiuri–Vajda, Catalan, Cassini, and d’Ocagne types satisfied by this sequence. These results provide a systematic description of the algebraic structure associated with the sequence of numbers that are simultaneously triangular and centered triangular.
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