This number is a prime.

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7219 = 19³ + 19² - 1, i.e. the only case when the cubic polynomial x³+x²-1 applied to the prime formed from its last two digits (19) gives back the original number. Note that it is also a permutation of the Hardy-Ramanujan number. [Leonardis]

Submitted: 2020-02-08 07:21:27;   Last Modified: 2020-02-08 07:52:46.
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