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做了N久，是因为一句话没理解。。。。。。汗了

Posted by Berry at 2007-08-08 19:43:58 on Problem 3292 
An H-semi-prime is an H-number which is the product of exactly two H-primes:
一个H-semi-prime是一个这样的H-number，它正好能表示成两个H-primes的乘积，但这种表示法可以不唯一,同时，它不能表示为3个或者以上H-number的乘积。。。。。所以441=21*21=9*49也是一个H-semi-prime
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