Английская Википедия:231 (number)

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Шаблон:Infobox number 231 (two hundred [and] thirty-one) is the natural number following 230 and preceding 232.

Two hundred [and] thirty-one 231 = 3·7·11, sphenic number, triangular number, doubly triangular number, hexagonal number, octahedral number,[1] centered octahedral number,[2] the number of integer partitions of 16, Mertens function returns 0,[3] and is the number of cubic inches in a U.S. liquid gallon.

References

Шаблон:Reflist Шаблон:Integers

Шаблон:Num-stub