login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A015126 Least k such that phi(k) = phi(n). 7
1, 1, 3, 3, 5, 3, 7, 5, 7, 5, 11, 5, 13, 7, 15, 15, 17, 7, 19, 15, 13, 11, 23, 15, 25, 13, 19, 13, 29, 15, 31, 17, 25, 17, 35, 13, 37, 19, 35, 17, 41, 13, 43, 25, 35, 23, 47, 17, 43, 25, 51, 35, 53, 19, 41, 35, 37, 29, 59, 17, 61, 31, 37, 51, 65, 25, 67, 51, 69, 35, 71, 35, 73 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..10000

PROG

(PARI) a(n) = {my(en = eulerphi(n)); k = 1; while (eulerphi(k) != en, k++); return (k); } \\ Michel Marcus, Jun 17 2013

CROSSREFS

Cf. A000010, A028476, A066412, A066659.

Sequence in context: A114003 A219792 A029622 * A219793 A215495 A299149

Adjacent sequences:  A015123 A015124 A015125 * A015127 A015128 A015129

KEYWORD

nonn,look

AUTHOR

Vladeta Jovovic, Jan 12 2002

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 April 18 16:37 EDT 2019. Contains 322209 sequences. (Running on oeis4.)