The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
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!)
A069549 Smallest composite k such that phi(k) > k*(1-1/n). 2
4, 4, 9, 25, 25, 49, 49, 121, 121, 121, 121, 169, 169, 289, 289, 289, 289, 361, 361, 529, 529, 529, 529, 841, 841, 841, 841, 841, 841, 961, 961, 1369, 1369, 1369, 1369, 1369, 1369, 1681, 1681, 1681, 1681, 1849, 1849, 2209, 2209, 2209, 2209, 2809, 2809, 2809 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Or, least composite k such that k is coprime to the n-1 numbers k+1 ... k+n-1. E.g. a(4) = 25 because 25 is coprime to 26, 27 and 28. - Amarnath Murthy, Apr 20 2004
LINKS
FORMULA
a(n)=nextprime(n)^2=A007918(n)^2
CROSSREFS
Cf. A052349.
Sequence in context: A192030 A117879 A334009 * A118069 A089539 A324010
KEYWORD
easy,nonn
AUTHOR
Benoit Cloitre, Apr 21 2002
EXTENSIONS
Edited by David Wasserman, Apr 23 2007
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 May 19 11:36 EDT 2024. Contains 372683 sequences. (Running on oeis4.)