“ImpracticalNumber”的概念、定义、习题解题方法及翻译-数学辞典

单词	ImpracticalNumber
释义	impractical number An impractical number $n$ is an even abundant number that is not a practical number under the second definition. The first few impractical numbers are 70, 102, 114, 138, 174, 186, 222, 246, 258, 282, 318, 350, 354, 366, 372, 402, 426, 438, 444, 474, 490, 492, 498; these are listed in A007621 of Sloane’s OEIS.
随便看	design Determinant determinant DeterminantAsAMultilinearMapping determinant as a multilinear mapping DeterminantConditionForASequenceOfVectors determinant condition for a sequence of vectors DeterminantInequalities determinant inequalities DeterminantInTermsOfTracesOfPowers determinant in terms of traces of powers DeterminantOfAntidiagonalMatrix determinant of anti-diagonal matrix DeterminantOfTheVandermondeMatrix determinant of the Vandermonde matrix DeterminantsOfSomeMatricesOfSpecialForm determinants of some matrices of special form DeterminationOfAbundantNumbersWithSpecifiedPrimeFactors determination of abundant numbers with specified prime factors DeterminationOfEvenAbundantNumbersWithOneOddPrimeFactor determination of even abundant numbers with one odd prime factor DeterminationOfFourierCoefficients determination of Fourier coefficients DeterminingEnvelope determining envelope

数学辞典收录了18232条数学词条，基本涵盖了常用数学知识及数学英语单词词组的翻译及用法，是数学学习的有利工具。

impractical number