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Hill 881 was the site of fierce and bloody fighting between soldiers of the North Vietnamese Army and United States Marines during the Vietnam War. The number refers to the elevation of the hill in meters. The binary digits extraction from the decimal expansion of truncated to 10 places (1101110001) and converted to base 10 gives prime 881. [De Geest] The largest threedigit 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] There are 881 distinct Pythagorean triangles whose sides do not exceed a thousand. [Beedassy] The largest of only two prime numbers with squares of the form AABCBC. (The other is 577). [Loungrides] The smallest nontrivial (mutidigit) Sophie Germain prime p such that ppi(p) is a perfect cube, i.e., (881152 = 9^3). [Bajpai]
(There is one curio for this number that has not yet been approved by an editor.)
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