login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A323169 Greatest common divisor of the set of solutions to phi(x) = n, or 0 if n is not a totient. 2
1, 1, 0, 1, 0, 1, 0, 1, 0, 11, 0, 1, 0, 0, 0, 1, 0, 1, 0, 1, 0, 23, 0, 1, 0, 0, 0, 29, 0, 31, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 23, 0, 47, 0, 1, 0, 0, 0, 53, 0, 81, 0, 29, 0, 59, 0, 1, 0, 0, 0, 1, 0, 67, 0, 0, 0, 71, 0, 1, 0, 0, 0, 0, 0, 79, 0, 1, 0, 83, 0, 1, 0, 0, 0, 1, 0, 0, 0, 47, 0, 0, 0, 1, 0, 0, 0, 1, 0, 103, 0, 53, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,10
LINKS
FORMULA
a(n) = 0 iff A014197(n) == 0.
PROG
(PARI) A323169(n) = gcd(invphi(n)); \\ With invphi from Max Alekseyev's PARI-script collection
CROSSREFS
Cf. A000010, A014197, A303745 (positions of terms larger than one), A323514 (their characteristic function).
Sequence in context: A110408 A179920 A216726 * A143197 A138066 A173189
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jan 18 2019
STATUS
approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 28 14:21 EDT 2024. Contains 371254 sequences. (Running on oeis4.)