login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A318459 a(n) = gcd(n, tau(n), phi(n)), where tau = A000005 and phi = A000010. 4
1, 1, 1, 1, 1, 2, 1, 4, 3, 2, 1, 2, 1, 2, 1, 1, 1, 6, 1, 2, 1, 2, 1, 8, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 3, 1, 2, 1, 8, 1, 2, 1, 2, 3, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 8, 1, 2, 1, 4, 1, 2, 3, 1, 1, 2, 1, 2, 1, 2, 1, 12, 1, 2, 1, 2, 1, 2, 1, 2, 1, 2, 1, 12, 1, 2, 1, 8, 1, 6, 1, 2, 1, 2, 1, 4, 1, 2, 3, 1, 1, 2, 1, 8, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..65537

FORMULA

a(n) = gcd(n, A000005(n), A000010(n)).

a(n) = gcd(n,A009213(n)) = gcd(A000005(n),A009195(n)) = gcd(A000010(n),A009191(n)).

MATHEMATICA

Table[GCD[n, DivisorSigma[0, n], EulerPhi[n]], {n, 110}] (* Harvey P. Dale, Jul 30 2019 *)

PROG

(PARI) A318459(n) = gcd([n, numdiv(n), eulerphi(n)]);

CROSSREFS

Cf. A000005, A000010, A009191, A009195, A009213.

Cf. also A074389.

Sequence in context: A248929 A109977 A201199 * A300823 A175702 A303781

Adjacent sequences:  A318456 A318457 A318458 * A318460 A318461 A318462

KEYWORD

nonn

AUTHOR

Antti Karttunen, Sep 07 2018, after Labos Elemer's A074389

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 6 08:51 EDT 2020. Contains 335476 sequences. (Running on oeis4.)