11

This number is a prime.

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Take all twin primes (including the "Siamese twins" 2,3) less than 11, namely: (2,3), (3,5), (5,7). If we square each prime and then add the squared prime pairs together, we get 121. Or, 11^2. [Missailidis]

Submitted: 2018-04-01 01:40:04;   Last Modified: 2018-04-01 08:40:24.
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