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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A147550 Smallest n-digit number m such that phi(m) is minimal. 2
 1, 10, 102, 1050, 10080, 101010, 1021020, 10210200, 100150050, 1009788780, 10039179150, 100614884370, 1002802450650, 10028024506500, 100093293239940, 1003203571630260, 10040258696397930, 100098336700452090, 1004819888620217670, 10034477941390913010, 100227034561924099830, 1004115014967006472530, 10014709889018759594670 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS For all n, A147551(n) = phi(a(n)). LINKS Max Alekseyev, Table of n, a(n) for n = 1..31 EXAMPLE phi(10)=4 and there is no 2-digit number t such that phi(t)<4 so a(2)=10. phi(102)=32 and there is no 3-digit number t such that phi(t)<32 also phi(100) and phi(101) are greater than 32, so a(3)=102. CROSSREFS Cf. A147551. Sequence in context: A158242 A147636 A191014 * A162666 A061630 A062806 Adjacent sequences: A147547 A147548 A147549 * A147551 A147552 A147553 KEYWORD base,nonn AUTHOR Farideh Firoozbakht, Nov 22 2008 EXTENSIONS a(11)-a(31) from Max Alekseyev, Feb 02 2012, Feb 14 2018 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.

Last modified April 17 11:15 EDT 2024. Contains 371763 sequences. (Running on oeis4.)