KUMAR, Nand Kishor; SHAH, Raj Kumar. Exploring the Symmetry and relationship among Harshad Numbers, Fortunate Numbers, Lucky Numbers, and Happy Numbers in Economics. THE ACADEMIA, [S. l.], v. 6, n. 1, p. 87–94, 2026. DOI: 10.3126/ta.v6i1.90323. Disponível em: https://nepjol.info/index.php/ta/article/view/90323. Acesso em: 3 feb. 2026.