This number is a composite.

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The only strobogrammatic brilliant number that can be represented as sum of two powers with distinct prime-digits as bases and distinct composite digits as exponents, i.e., 2^6+5^4 = 689 = 13 × 53. [Loungrides]

Submitted: 2018-08-16 07:33:01;   Last Modified: 2020-07-23 10:00:09.
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