49

This number is a composite.

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The smallest prime square that is the sum of consecutive composite numbers in three ways, i.e., 24+25 = 15+16+18 = 4+6+8+9+10+12 = 7^2. [Loungrides]

100^49 + 49 is the largest non-titanic prime of form 100^n + n. [Loungrides]