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发表于 2009-12-12 18:26
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发现3个超级完美数
Number Theory > Special Numbers > Divisor-Related Numbers >
Recreational Mathematics > Mathematical Records >
Multiperfect Number
A number is -multiperfect (also called a -multiply perfect number or -pluperfect number) if
for some integer , where is the divisor function. The value of is called the class. The special case corresponds to perfect numbers , which are intimately connected with Mersenne primes (Sloane';s A000396). The number 120 was long known to be 3-multiply perfect () since
The following table gives the first few for , 3, ..., 6.
2 A000396 6, 28, 496, 8128, ...
3 A005820 120, 672, 523776, 459818240, 1476304896, 51001180160
4 A027687 30240, 32760, 2178540, 23569920, ...
5 A046060 14182439040, 31998395520, 518666803200, ...
6 A046061 154345556085770649600, 9186050031556349952000, ...
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