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Generalized taxicab number : ウィキペディア英語版
Generalized taxicab number

In mathematics, the generalized taxicab number ''Taxicab''(''k'', ''j'', ''n'') is the smallest number which can be expressed as the sum of ''j'' ''k''th positive powers in ''n'' different ways. For ''k'' = 3 and ''j'' = 2, they coincide with taxicab numbers.
:\mathrm(1, 2, 2) = 4 = 1 + 3 = 2 + 2.
:\mathrm(2, 2, 2) = 50 = 1^2 + 7^2 = 5^2 + 5^2.
:\mathrm(3, 2, 2) = 1729 = 1^3 + 12^3 = 9^3 + 10^3 - famously stated by Ramanujan.
Euler showed that
:\mathrm(4, 2, 2) = 635318657 = 59^4 + 158^4 = 133^4 + 134^4.
However, ''Taxicab''(5, 2, ''n'') is not known for any ''n'' ≥ 2; no positive integer is known which can be written as the sum of two fifth powers in more than one way.〔

==See also==

*Cabtaxi number

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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