881

This number is a prime.

Just showing those entries submitted by 'Kilpatrick': (Click here to show all)

+ The largest three-digit prime of any form ABC such that A + BC, AB + C, and A + B + C are prime. In the case of 881: 8 + 81; 88 + 1; and 8 + 8 + 1 are all prime. [Kilpatrick]

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