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18158961567721 = 13 * 373 * 11173 * 335173 is a Zeisel Number because its four prime factors are consecutive elements of the linear recurrence prime(i+1) = 30*prime(i) - 17. Curiously, it is also an emirp, since 12776516985181 is prime. The digital sum 67 is prime. [Post]

 

  Submitted: 2005-07-31 19:47:44;   Last Modified: 2008-01-30 11:28:00.



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