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    Pentagonal Triangular Number

    Definition

    A number which is simultaneously a pentagonal number P_n and triangular number T_m. Such numbers exist when 1/2 n(3n - 1) = 1/2 m(m + 1). Completing the square gives (6n - 1)^2 - 3(2m + 1)^2 = - 2.

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