11-05-2021

4d Arithmetic Code Number 2018 Free Download

Demonstration, with Cuisenaire rods, of the arithmetic nature of the number 6

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In number theory, an arithmetic number is an integer for which the average of its positivedivisors is also an integer. For instance, 6 is an arithmetic number because the average of its divisors is

1+2+3+64=3,{displaystyle {frac {1+2+3+6}{4}}=3,}

which is also an integer. However, 2 is not an arithmetic number because its only divisors are 1 and 2, and their average 3/2 is not an integer.

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The first numbers in the sequence of arithmetic numbers are

1, 3, 5, 6, 7, 11, 13, 14, 15, 17, 19, 20, 21, 22, 23, 27, 29, 30, 31, 33, 35, 37, 38, 39, 41, 42, 43, 44, 45, 46, 47, 49, ... (sequence A003601 in the OEIS).

Density[edit]

It is known that the natural density of such numbers is 1:[1] indeed, the proportion of numbers less than X which are not arithmetic is asymptotically[2]

exp⁡(−clog⁡log⁡X){displaystyle exp left({-c{sqrt {log log X}}}right)}

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where c = 2√log 2 + o(1).

2018

A number N is arithmetic if the number of divisorsd(N) divides the sum of divisors σ(N). It is known that the density of integers N obeying the stronger condition that d(N)2 divides σ(N) is 1/2.[1][2]

Notes[edit]

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  1. ^ abGuy (2004) p.76
  2. ^ abBateman, Paul T.; Erdős, Paul; Pomerance, Carl; Straus, E.G. (1981). 'The arithmetic mean of the divisors of an integer'. In Knopp, M.I. (ed.). Analytic number theory, Proc. Conf., Temple Univ., 1980(PDF). Lecture Notes in Mathematics. 899. Springer-Verlag. pp. 197–220. Zbl0478.10027.

4d Arithmetic Code Number 2018 Free Download 64 Bit Windows

References[edit]

  • Guy, Richard K. (2004). Unsolved problems in number theory (3rd ed.). Springer-Verlag. B2. ISBN978-0-387-20860-2. Zbl1058.11001.

Magnum 4d Arithmetic

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