Triangular numbers whose sum of divisors
 is also triangular

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Douglas E. Iannucci, Florian Luca Acta Arithmetica 129 (2007), 23-40 MSC: Primary 11N37; Secondary 11A25, 11N36. DOI: 10.4064/aa129-1-2

Douglas E. IannucciUniversity of the Virgin Islands
St. Thomas, VI 00802, U.S.A.
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Florian LucaInstituto de Matemáticas
Universidad Nacional Autonoma de México
C.P. 58089, Morelia, Michoacán, México
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