7

This number is a prime.

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There is only one known case where the average of an amicable pair sum ends with the digit 7. The pair (1184, 1210) was discovered in 1866 by teenager B. Nicolò I. Paganini.

Submitted: 2018-02-22 02:58:55; Last Modified: 2018-02-22 03:09:12.