149

This number is a prime.

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The sum of three consecutive squares (the middle one being 1*49) is equal to the concatenation of the first three consecutive squares {1~4~9}. Note that π(149) = -1+4*9. [Worrom]

Submitted: 2022-03-03 19:19:03; Last Modified: 2022-03-03 23:42:58.