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Frugal number : ウィキペディア英語版
Frugal number
A frugal number is a natural number that has more digits than the number of digits in its prime factorization (including exponents). For example, using base-10 arithmetic, the first few frugal numbers are 125 (53), 128 (27), 243 (35), and 256 (28). Frugal numbers also exist in other bases; for instance, in binary arithmetic thirty-two is a frugal number, since 10101 = 100000.
The base-10 frugal numbers up to 2000 are:
:125, 128, 243, 256, 343, 512, 625, 729, 1024, 1029, 1215, 1250, 1280, 1331, 1369, 1458, 1536, 1681, 1701, 1715, 1792, 1849, 1875
The term economical number has been used about a frugal number, but also about a number which is either frugal or equidigital.
== See also ==

*Equidigital number
*Extravagant 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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