59

This number is a prime.

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59 is conjectured to be the only prime p such that the sum of all prime and composite digits up to p are equal, i.e., 2+3+5+7+2+...+5 = 4+6+8+9+4+...+9. [Sariyar]

Submitted: 2021-06-30 18:25:15;   Last Modified: 2021-07-01 07:52:11.
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