7841

This number is a prime.

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+ The first case of a prime such that removing respectively the last and first digit one obtains two consecutive perfect squares: 28²=784 and 29²=841. Moreover, notice that 28 and 29 are the possible number of days in the month of February, and 28 is a perfect number while 29 is another prime. [Leonardis]

(There is one curio for this number that has not yet been approved by an editor.)

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