The pseudosmarandache function Z(n) is the smallest integer such that sum_(k = 1)^(Z(n)) k = 1/2 Z(n)[Z(n) + 1] is divisible by n. The values for n = 1, 2, ... are 1, 3, 2, 7, 4, 3, 6, 15, 8, 4, ... (OEIS A011772; Kashihara 1996; Russo 2000, p. 4).
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