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Let ''k'' be a [[positive integer]]. In [[number theory]], '''Jordan's totient function''' <math>J_k(n)</math> of a positive integer ''n'' is the number of ''k''-tuples of positive integers all less than or equal to ''n'' that form a [[coprime]] (''k''&nbsp;+&nbsp;1)-tuple together with ''n''. This is a generalisation of Euler's [[totient function]], which is ''J''<sub>1</sub>. The function is named after [[Camille Jordan]].


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==Definition==
 
Jordan's totient function is [[multiplicative function|multiplicative]] and may be evaluated as
:<math>J_k(n)=n^k \prod_{p|n}\left(1-\frac{1}{p^k}\right) .\,</math>
 
==Properties==
 
* <math>\sum_{d | n } J_k(d) = n^k. \, </math>
which may be written in the language of [[Dirichlet convolution]]s as<ref>Sándor & Crstici (2004) p.106</ref>
: <math>J_k(n) \star 1 = n^k\,</math>
and via [[Möbius inversion formula|Möbius inversion]] as
:<math>J_k(n) = \mu(n) \star n^k</math>.
Since the [[Dirichlet generating function]] of μ is 1/ζ(s) and the
Dirichlet generating function of n<sup>k</sup> is ζ(s-k), the series for
J<sub>k</sub> becomes
:<math>\sum_{n\ge 1}\frac{J_k(n)}{n^s} = \frac{\zeta(s-k)}{\zeta(s)}</math>.
 
* An [[Average order of an arithmetic function|average order]] of ''J''<sub>''k''</sub>(''n'') is 
:<math>\frac{n^k}{\zeta(k+1)}</math>.
* The [[Dedekind psi function]] is
:<math>\psi(n) = \frac{J_2(n)}{J_1(n)}</math>,
and by inspection of the definition (recognizing that each factor in the product
over the primes is a cyclotomic polynomial of p<sup>-k</sup>), the arithmetic functions
defined by <math>\frac{J_k(n)}{J_1(n)}</math> or <math>\frac{J_{2k}(n)}{J_k(n)}</math>
can also be shown to be integer-valued multiplicative functions.
 
* <math>
\sum_{\delta\mid n}\delta^sJ_r(\delta)J_s\left(\frac{n}{\delta}\right) = J_{r+s}(n)
</math> &nbsp; &nbsp; &nbsp;<ref>Holden et al in external links The formula is Gegenbauer's</ref>
 
==Order of matrix groups==
 
The [[general linear group]] of matrices of order ''m'' over '''Z'''<sub>''n''</sub> has order<ref>All of these formulas are from Andrici and Priticari in [[#External links]]</ref>
:<math>
|\operatorname{GL}(m,\mathbf{Z}_n)|=n^{\frac{m(m-1)}{2}}\prod_{k=1}^m J_k(n).
</math>
 
The [[special linear group]] of matrices of order ''m'' over ''Z''<sub>''n''</sub> has order
:<math>
|\operatorname{SL}(m,\mathbf{Z}_n)|=n^{\frac{m(m-1)}{2}}\prod_{k=2}^m J_k(n).
</math>
 
The [[symplectic group]] of matrices of order ''m'' over ''Z''<sub>''n''</sub> has order
:<math>
|\operatorname{Sp}(2m,\mathbf{Z}_n)|=n^{m^2}\prod_{k=1}^m J_{2k}(n).
</math>
 
The first two formulas were discovered by Jordan.
 
==Examples==
 
Explicit lists in the [[OEIS]] are
J<sub>2</sub> in {{OEIS2C|A007434}},
J<sub>3</sub> in {{OEIS2C|A059376}},
J<sub>4</sub> in {{OEIS2C|A059377}},
J<sub>5</sub> in {{OEIS2C|A059378}},
J<sub>6</sub> up to J<sub>10</sub> in {{OEIS2C|A069091}}
up to {{OEIS2C|A069095}}.
       
                       
Multiplicative functions defined by ratios are
J<sub>2</sub>(n)/J<sub>1</sub>(n) in {{OEIS2C|A001615}},
J<sub>3</sub>(n)/J<sub>1</sub>(n) in {{OEIS2C|A160889}},
J<sub>4</sub>(n)/J<sub>1</sub>(n) in {{OEIS2C|A160891}},
J<sub>5</sub>(n)/J<sub>1</sub>(n) in {{OEIS2C|A160893}},
J<sub>6</sub>(n)/J<sub>1</sub>(n) in {{OEIS2C|A160895}},
J<sub>7</sub>(n)/J<sub>1</sub>(n) in {{OEIS2C|A160897}},
J<sub>8</sub>(n)/J<sub>1</sub>(n) in {{OEIS2C|A160908}},
J<sub>9</sub>(n)/J<sub>1</sub>(n) in {{OEIS2C|A160953}},
J<sub>10</sub>(n)/J<sub>1</sub>(n) in {{OEIS2C|A160957}},
J<sub>11</sub>(n)/J<sub>1</sub>(n) in {{OEIS2C|A160960}}.
       
                       
Examples of the ratios J<sub>2k</sub>(n)/J<sub>k</sub>(n) are
J<sub>4</sub>(n)/J<sub>2</sub>(n) in {{OEIS2C|A065958}},
J<sub>6</sub>(n)/J<sub>3</sub>(n) in {{OEIS2C|A065959}},
and
J<sub>8</sub>(n)/J<sub>4</sub>(n) in {{OEIS2C|A065960}}.
 
==Notes==
 
{{reflist}}
 
==References==
 
* {{cite book | author=L. E. Dickson | authorlink=Leonard Eugene Dickson | title=[[History of the Theory of Numbers]], Vol. I | origyear=1919 |year=1971 | publisher=[[Chelsea Publishing]] | isbn=0-8284-0086-5 | jfm=47.0100.04 | page=147 }}
*{{cite book | title=Problems in Analytic Number Theory | author=M. Ram Murty | authorlink=M. Ram Murty | volume=206 | series=[[Graduate Texts in Mathematics]] | publisher=[[Springer-Verlag]] | year=2001 | isbn=0-387-95143-1 | zbl=0971.11001  | page=11 }}
* {{cite book | last1=Sándor | first1=Jozsef | last2=Crstici | first2=Borislav | title=Handbook of number theory II | location=Dordrecht | publisher=Kluwer Academic | year=2004 | isbn=1-4020-2546-7 | pages=32–36 | zbl=1079.11001 }}
 
==External links==
*{{cite journal|first1=Dorin |last1=Andrica |first2= Mihai |last2=Piticari
|url=http://www.emis.de/journals/AUA/acta7/Andrica%20.pdf
|journal=Acta universitatis Apulensis
|year=2004
|number=7
|mr=2157944
|title= On some Extensions of Jordan's arithmetical Functions
}}
* {{cite web |first1=Matthew |last1=Holden|first2=Michael |last2=Orrison
|first3=Michael |last3=Varble
|url=http://www.math.hmc.edu/~orrison/research/papers/totient.pdf
|title= Yet another Generalization of Euler's Totient Function
}}
 
{{Totient}}
 
[[Category:Number theory]]
[[Category:Modular arithmetic]]
[[Category:Multiplicative functions]]

Revision as of 14:16, 29 January 2014

Let k be a positive integer. In number theory, Jordan's totient function Jk(n) of a positive integer n is the number of k-tuples of positive integers all less than or equal to n that form a coprime (k + 1)-tuple together with n. This is a generalisation of Euler's totient function, which is J1. The function is named after Camille Jordan.

Definition

Jordan's totient function is multiplicative and may be evaluated as

Jk(n)=nkp|n(11pk).

Properties

which may be written in the language of Dirichlet convolutions as[1]

Jk(n)1=nk

and via Möbius inversion as

Jk(n)=μ(n)nk.

Since the Dirichlet generating function of μ is 1/ζ(s) and the Dirichlet generating function of nk is ζ(s-k), the series for Jk becomes

n1Jk(n)ns=ζ(sk)ζ(s).
nkζ(k+1).
ψ(n)=J2(n)J1(n),

and by inspection of the definition (recognizing that each factor in the product over the primes is a cyclotomic polynomial of p-k), the arithmetic functions defined by Jk(n)J1(n) or J2k(n)Jk(n) can also be shown to be integer-valued multiplicative functions.

Order of matrix groups

The general linear group of matrices of order m over Zn has order[3]

|GL(m,Zn)|=nm(m1)2k=1mJk(n).

The special linear group of matrices of order m over Zn has order

|SL(m,Zn)|=nm(m1)2k=2mJk(n).

The symplectic group of matrices of order m over Zn has order

|Sp(2m,Zn)|=nm2k=1mJ2k(n).

The first two formulas were discovered by Jordan.

Examples

Explicit lists in the OEIS are J2 in Physiotherapist Rave from Cobden, has hobbies and interests which includes skateboarding, commercial property for sale developers in singapore and coin collecting. May be a travel freak and in recent years made a journey to Wet Tropics of Queensland., J3 in Physiotherapist Rave from Cobden, has hobbies and interests which includes skateboarding, commercial property for sale developers in singapore and coin collecting. May be a travel freak and in recent years made a journey to Wet Tropics of Queensland., J4 in Physiotherapist Rave from Cobden, has hobbies and interests which includes skateboarding, commercial property for sale developers in singapore and coin collecting. May be a travel freak and in recent years made a journey to Wet Tropics of Queensland., J5 in Physiotherapist Rave from Cobden, has hobbies and interests which includes skateboarding, commercial property for sale developers in singapore and coin collecting. May be a travel freak and in recent years made a journey to Wet Tropics of Queensland., J6 up to J10 in Physiotherapist Rave from Cobden, has hobbies and interests which includes skateboarding, commercial property for sale developers in singapore and coin collecting. May be a travel freak and in recent years made a journey to Wet Tropics of Queensland. up to Physiotherapist Rave from Cobden, has hobbies and interests which includes skateboarding, commercial property for sale developers in singapore and coin collecting. May be a travel freak and in recent years made a journey to Wet Tropics of Queensland..


Multiplicative functions defined by ratios are J2(n)/J1(n) in Physiotherapist Rave from Cobden, has hobbies and interests which includes skateboarding, commercial property for sale developers in singapore and coin collecting. May be a travel freak and in recent years made a journey to Wet Tropics of Queensland., J3(n)/J1(n) in Physiotherapist Rave from Cobden, has hobbies and interests which includes skateboarding, commercial property for sale developers in singapore and coin collecting. May be a travel freak and in recent years made a journey to Wet Tropics of Queensland., J4(n)/J1(n) in Physiotherapist Rave from Cobden, has hobbies and interests which includes skateboarding, commercial property for sale developers in singapore and coin collecting. May be a travel freak and in recent years made a journey to Wet Tropics of Queensland., J5(n)/J1(n) in Physiotherapist Rave from Cobden, has hobbies and interests which includes skateboarding, commercial property for sale developers in singapore and coin collecting. May be a travel freak and in recent years made a journey to Wet Tropics of Queensland., J6(n)/J1(n) in Physiotherapist Rave from Cobden, has hobbies and interests which includes skateboarding, commercial property for sale developers in singapore and coin collecting. May be a travel freak and in recent years made a journey to Wet Tropics of Queensland., J7(n)/J1(n) in Physiotherapist Rave from Cobden, has hobbies and interests which includes skateboarding, commercial property for sale developers in singapore and coin collecting. May be a travel freak and in recent years made a journey to Wet Tropics of Queensland., J8(n)/J1(n) in Physiotherapist Rave from Cobden, has hobbies and interests which includes skateboarding, commercial property for sale developers in singapore and coin collecting. May be a travel freak and in recent years made a journey to Wet Tropics of Queensland., J9(n)/J1(n) in Physiotherapist Rave from Cobden, has hobbies and interests which includes skateboarding, commercial property for sale developers in singapore and coin collecting. May be a travel freak and in recent years made a journey to Wet Tropics of Queensland., J10(n)/J1(n) in Physiotherapist Rave from Cobden, has hobbies and interests which includes skateboarding, commercial property for sale developers in singapore and coin collecting. May be a travel freak and in recent years made a journey to Wet Tropics of Queensland., J11(n)/J1(n) in Physiotherapist Rave from Cobden, has hobbies and interests which includes skateboarding, commercial property for sale developers in singapore and coin collecting. May be a travel freak and in recent years made a journey to Wet Tropics of Queensland..


Examples of the ratios J2k(n)/Jk(n) are J4(n)/J2(n) in Physiotherapist Rave from Cobden, has hobbies and interests which includes skateboarding, commercial property for sale developers in singapore and coin collecting. May be a travel freak and in recent years made a journey to Wet Tropics of Queensland., J6(n)/J3(n) in Physiotherapist Rave from Cobden, has hobbies and interests which includes skateboarding, commercial property for sale developers in singapore and coin collecting. May be a travel freak and in recent years made a journey to Wet Tropics of Queensland., and J8(n)/J4(n) in Physiotherapist Rave from Cobden, has hobbies and interests which includes skateboarding, commercial property for sale developers in singapore and coin collecting. May be a travel freak and in recent years made a journey to Wet Tropics of Queensland..

Notes

43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.

References

  • 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.

    My blog: http://www.primaboinca.com/view_profile.php?userid=5889534
  • 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.

    My blog: http://www.primaboinca.com/view_profile.php?userid=5889534
  • 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.

    My blog: http://www.primaboinca.com/view_profile.php?userid=5889534

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  1. Sándor & Crstici (2004) p.106
  2. Holden et al in external links The formula is Gegenbauer's
  3. All of these formulas are from Andrici and Priticari in #External links