MathSciNet bibliographic data MR843513 (87e:11039) 11D25 Ma, De Gang An elementary proof of the solutions to the Diophantine equation \$6y\sp 2=x(x+1)(2x+1)\$$6y\sp 2=x(x+1)(2x+1)$. (Chinese) Sichuan Daxue Xuebao 1985, no. 4, 107–116. Links to the journal or article are not yet available

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