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    Pluperfect Number

    Definition

    A number n is k-multiperfect (also called a k-multiply perfect number or k-pluperfect number) if σ(n) = k n for some integer k>2, where σ(n) is the divisor function. The value of k is called the class. The special case k = 2 corresponds to perfect numbers P_2, which are intimately connected with Mersenne primes (OEIS A000396). The number 120 was long known to be 3-multiply perfect (P_3) since σ(120) = 3·120. The following table gives the first few P_n for n = 2, 3, ..., 6.

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