18158961567721

This number is a composite.

                                                             1815 8961567721

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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]

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