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Published online by Cambridge University Press: 20 January 2009
In (1; p. 38), A. P. Guinand discusses the plane partition function q(n). He observes that q(3), q(6), q(9), q(15), q(18), q(21), and q(24) are respectively 6, 48, 282, 1479, 6879, 29601, 118794, and 451194. As all these are multiples of 3 he suggests the conjecture that q(3n) ≡ 0 (mod 3) for all positive integers n.